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Author Topic: UNLSHD - Blue 2005 LJ  (Read 9048 times)
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unleashd
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« Reply #120 on: April 26, 2019, 06:19:58 AM »

After multiple discussions with Frank and Rich, ordered Yukon gears yesterday. Will be moving up to 4.88. Lockers will be done at another time.

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Prakash

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2005  LJ

Quote from: Runner
A 3.73 ratio, or 4.10 for that matter, won't cut it with 32-33" tires and the 42RLE automatic.  4.88 is the sweet spot
Runner
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« Reply #121 on: April 26, 2019, 11:38:37 AM »

I know you and I have talked about this, but if you have any intentions of going to 35" tires eventually, then consider going 5.13 gears.  These will work fine for 33" tires, then moving up to 35".  Ultimately, a 5.38 gear is the best choice for a 35" tire, but the 5.13 is a very good compromise.  Bottom line, 4.88 will work for 33", but not for 35".


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2004 LJ, 1999 TJ Sporticon - "Owning a Jeep is a sickness. However, it's one I'll gladly endure!"
RFH_98TJ
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« Reply #122 on: April 26, 2019, 01:58:08 PM »

Wow.  Big difference with the trans he has.  Good thing you know about them. Cheers

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98 TJ 4.0 Sport 5-speed - 4" lift on 33s, 4.56 on D30 with Lock Right and Ford 8.8 LS, more stuff to come

- Frank
Runner
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« Reply #123 on: April 27, 2019, 03:00:41 PM »

The 42RLE gets a bad rap, but it's actually a good transmission. As a testimony to its ability, Savvy/Currie ran an LJ in the stock class for King of Hammers and won two years in a row (2012 -2013).  The reason he needs 5.38 gears for running 35s is because of the gear ratios.  For comparison, here's what the 42RLE looks like against the AX15 Manual:

42RLE Gear Ratios: 1st gear is 2.84, 1.57, 1:1, and a overdrive gear of .69

AX15 Gear Ratios: 3.83, 2.33, 1.44, 1.00, and a overdrive gear of 0.79


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2004 LJ, 1999 TJ Sporticon - "Owning a Jeep is a sickness. However, it's one I'll gladly endure!"
RFH_98TJ
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« Reply #124 on: April 29, 2019, 06:19:11 AM »

That's a pretty big difference between them.

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98 TJ 4.0 Sport 5-speed - 4" lift on 33s, 4.56 on D30 with Lock Right and Ford 8.8 LS, more stuff to come

- Frank
RattleTrap55
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84 CJ7
« Reply #125 on: April 29, 2019, 10:21:04 AM »

The 42RLE gets a bad rap, but it's actually a good transmission. As a testimony to its ability, Savvy/Currie ran an LJ in the stock class for King of Hammers and won two years in a row (2012 -2013).  The reason he needs 5.38 gears for running 35s is because of the gear ratios.  For comparison, here's what the 42RLE looks like against the AX15 Manual:

42RLE Gear Ratios: 1st gear is 2.84, 1.57, 1:1, and a overdrive gear of .69

AX15 Gear Ratios: 3.83, 2.33, 1.44, 1.00, and a overdrive gear of 0.79

Not to high jack this thread but --- dang this is really food for thought as I am building a TJ for the kids with a Torqueflite 999 (32RH) automatic (1st gear 2.74,1.54 and 3rd of 1.00 with no overdrive) mated to a 4.0L sporting 3.07 gears. What this says to me is that this is a little like driving the CJ (T5) using only 2nd, 3rd, and 4th. That would be painful with 3.07 gears - I get it! Now I have quiet a bit more noodling to do - how do I balance the in-town/trail drivability vs. highway on 33 inch tires and the 32RH...

Thank You

PS: The T5 gear ratios are 1st gear 4.03:1, 2.37:1, 1.50:1, 1.00:1 5th/overdrive .86:1 so my statement is a bit of an over reaction.

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4" Lift on 33's
4.2L w/HESCO MFI & Howard Cam
T-5 & Dana 300
Smittybilt 9,500 Winch
Spartan Locker

2018 JKU - box stock
2002 TJ Sahara w/Very Rusted Frame
unleashd
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« Reply #126 on: April 29, 2019, 12:23:52 PM »

The 42RLE gets a bad rap, but it's actually a good transmission. As a testimony to its ability, Savvy/Currie ran an LJ in the stock class for King of Hammers and won two years in a row (2012 -2013).  The reason he needs 5.38 gears for running 35s is because of the gear ratios.  For comparison, here's what the 42RLE looks like against the AX15 Manual:

42RLE Gear Ratios: 1st gear is 2.84, 1.57, 1:1, and a overdrive gear of .69

AX15 Gear Ratios: 3.83, 2.33, 1.44, 1.00, and a overdrive gear of 0.79

Not to high jack this thread but --- dang this is really food for thought as I am building a TJ for the kids with a Torqueflite 999 (32RH) automatic (1st gear 2.74,1.54 and 3rd of 1.00 with no overdrive) mated to a 4.0L sporting 3.07 gears. What this says to me is that this is a little like driving the CJ (T5) using only 2nd, 3rd, and 4th. That would be painful with 3.07 gears - I get it! Now I have quiet a bit more noodling to do - how do I balance the in-town/trail drivability vs. highway on 33 inch tires and the 32RH...

Thank You

PS: The T5 gear ratios are 1st gear 4.03:1, 2.37:1, 1.50:1, 1.00:1 5th/overdrive .86:1 so my statement is a bit of an over reaction.

After my gear swap, let me know if you want the 3.73 gears to upgrade from the 3.07s.

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Prakash

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2005  LJ

Quote from: Runner
A 3.73 ratio, or 4.10 for that matter, won't cut it with 32-33" tires and the 42RLE automatic.  4.88 is the sweet spot
unleashd
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Posts: 377
« Reply #127 on: April 29, 2019, 12:24:55 PM »

Rich, Great info. I'll stick to the 4.88 and 33's.

I know you and I have talked about this, but if you have any intentions of going to 35" tires eventually, then consider going 5.13 gears.  These will work fine for 33" tires, then moving up to 35".  Ultimately, a 5.38 gear is the best choice for a 35" tire, but the 5.13 is a very good compromise.  Bottom line, 4.88 will work for 33", but not for 35".



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Prakash

o|||||||o
2005  LJ

Quote from: Runner
A 3.73 ratio, or 4.10 for that matter, won't cut it with 32-33" tires and the 42RLE automatic.  4.88 is the sweet spot
sirjames186
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Posts: 2498
05 LJ
« Reply #128 on: April 30, 2019, 04:41:51 PM »

The 42RLE gets a bad rap, but it's actually a good transmission. As a testimony to its ability, Savvy/Currie ran an LJ in the stock class for King of Hammers and won two years in a row (2012 -2013).  The reason he needs 5.38 gears for running 35s is because of the gear ratios.  For comparison, here's what the 42RLE looks like against the AX15 Manual:

42RLE Gear Ratios: 1st gear is 2.84, 1.57, 1:1, and a overdrive gear of .69

AX15 Gear Ratios: 3.83, 2.33, 1.44, 1.00, and a overdrive gear of 0.79

Not to high jack this thread but --- dang this is really food for thought as I am building a TJ for the kids with a Torqueflite 999 (32RH) automatic (1st gear 2.74,1.54 and 3rd of 1.00 with no overdrive) mated to a 4.0L sporting 3.07 gears. What this says to me is that this is a little like driving the CJ (T5) using only 2nd, 3rd, and 4th. That would be painful with 3.07 gears - I get it! Now I have quiet a bit more noodling to do - how do I balance the in-town/trail drivability vs. highway on 33 inch tires and the 32RH...

Thank You

PS: The T5 gear ratios are 1st gear 4.03:1, 2.37:1, 1.50:1, 1.00:1 5th/overdrive .86:1 so my statement is a bit of an over reaction.
Grimm jeeper is your friend. Anyone considering a regear should check their site out. Has a very handy calculator for various engines, transmissions and transfer cases. Shows you everything you need to know.

Not that I don't trust Runner, or any of the other advice here, but if you just want to play with the numbers and find out info for yourself, that's the place to do it.

Sent from my SM-G930V using Tapatalk


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"I'm no longer ashamed to wheel with you." - Jeremy
unleashd
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« Reply #129 on: May 02, 2019, 06:05:43 AM »

Yukon gears arrived in the brown truck on Tuesday. Since I wouldn't be able to work on the differential gear swap myself for the next couple of months (work, family, travel etc.), I dropped off the Jeep at the shop to have the work done.





The Dana 44 rear pumpkin is all clean and ready to accept the new gears.



The carrier assembly that came out of the Jeep.





And the new assembly back into the pumpkin.

Point to note: I had ordered the YGK008 kit through Summit Racing. This is a standard package from Yukon for the front and rear 4.88 ring and pinion including a full rebuild kit. BUT, watch out before you place the order. Check to ensure whether you need the THIN CUT or THICK CUT gears for the rear Dana 44. The package I received has the THIN CUT gears. As a result, even after using the supplied shims, there is a 'considerable' amount of play in that assembly that has my tech stopped in his tracks to proceed further.


A long call and chat with the CSR at Summit helped with sorting things out. A new Thick cut gear set is being shipped overnight to the shop directly to avoid further delays and I have a return label to send back the thin cut gears. No additional charges. All the research and discussion confirmed that I have the correct gears for the front Dana 30. Excellent customer service from summit racing.
« Last Edit: May 02, 2019, 06:13:49 AM by unleashd »

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Prakash

o|||||||o
2005  LJ

Quote from: Runner
A 3.73 ratio, or 4.10 for that matter, won't cut it with 32-33" tires and the 42RLE automatic.  4.88 is the sweet spot
unleashd
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Posts: 377
« Reply #130 on: May 02, 2019, 06:16:49 AM »

OTOH, I do need some new shoes for the e-brakes  Twisted Evil Twisted Evil




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Prakash

o|||||||o
2005  LJ

Quote from: Runner
A 3.73 ratio, or 4.10 for that matter, won't cut it with 32-33" tires and the 42RLE automatic.  4.88 is the sweet spot
RFH_98TJ
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« Reply #131 on: May 02, 2019, 06:21:02 AM »

Inquiring minds want to know.  Did the tech find what was making the noise?

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98 TJ 4.0 Sport 5-speed - 4" lift on 33s, 4.56 on D30 with Lock Right and Ford 8.8 LS, more stuff to come

- Frank
unleashd
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Posts: 377
« Reply #132 on: May 02, 2019, 06:29:29 AM »

Inquiring minds want to know.  Did the tech find what was making the noise?

It was a bad bearing. The one closer to the yoke was worse than the rear. He said the front bearing was probably going to disintegrate sooner than later. I should have taken a pic when I was out there in the afternoon, but missed it. But, I have asked the shop to retain every little piece from this project for me to do some research and analysis later on. Also makes for some good study material  Thumbs Up

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Prakash

o|||||||o
2005  LJ

Quote from: Runner
A 3.73 ratio, or 4.10 for that matter, won't cut it with 32-33" tires and the 42RLE automatic.  4.88 is the sweet spot
Runner
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Posts: 2123
« Reply #133 on: May 02, 2019, 09:57:48 AM »


Not to high jack this thread but --- dang this is really food for thought as I am building a TJ for the kids with a Torqueflite 999 (32RH) automatic (1st gear 2.74,1.54 and 3rd of 1.00 with no overdrive) mated to a 4.0L sporting 3.07 gears. What this says to me is that this is a little like driving the CJ (T5) using only 2nd, 3rd, and 4th. That would be painful with 3.07 gears - I get it! Now I have quiet a bit more noodling to do - how do I balance the in-town/trail drivability vs. highway on 33 inch tires and the 32RH...


You can run the numbers like James said, but what they'll tell you is 4.10 gearing for the 32RH.  I'm considering installing one for my '99 and have researched it to death.  The 32RH with 33" tires and 4.10 gears will put you right at 2500 RPMs at 65MPH.  You won't hit 3000 RPMs until you're just a little above 70MPH.  That works out perfect, because 70MPH is about all I'm comfortable with in a lifted TJ.

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2004 LJ, 1999 TJ Sporticon - "Owning a Jeep is a sickness. However, it's one I'll gladly endure!"
Runner
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Posts: 2123
« Reply #134 on: May 02, 2019, 10:01:49 AM »

Hopefully they replaced the inner seal while the carrier was out.  Also, the parking brake shoes and hardware, while the axle was out.  Replacing the parking brake shoes with the axle in is a pain in the a@%!  Other than that, you should be really happy with the new gears!   Thumbs Up

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2004 LJ, 1999 TJ Sporticon - "Owning a Jeep is a sickness. However, it's one I'll gladly endure!"
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