Author Topic: 4.88 gear swap in a 1994 pickup  (Read 424 times)

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MilesGC1999

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4.88 gear swap in a 1994 pickup
« on: Jun 12, 2019, 06:36:33 AM »
Yesterday I started my 4.88 gear swap in my 94 22re pickup. I dont have a ton of pictures but I will upload the ones I have.

I got a front and rear third member on marketplace last week.
The rear is a 4 cyl built with 4.88s and a lock right locker. The front is from a 4 runner and has a vacuum locker that is locked permanently for use with wheel hubs.

Yesterday I got the rear diff in and setup and the difference between 4.10 and 4.88 is insane. I have power through all gears now and I can't wait to get the front in. I will try and take more picture of the front install.

I'm planning on running 33s at some point with a 3 inch lift which is why I chose to get 4.88s and not 4.56s. For now I am going to run 31s since I dont have a lift. I just recently started a new job at Firestone and I'm thinking of getting their mt2s. I have heard they are quiet for mts and they last a decent while.

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Pat

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Re: 4.88 gear swap in a 1994 pickup
« Reply #1 on: Jun 12, 2019, 09:15:22 AM »
Nice,  You should swap out your non vacuum axle disconnect to the new third assuming your was non.  Cleans things up a bit and easy to do.
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MilesGC1999 [OP]

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Re: 4.88 gear swap in a 1994 pickup
« Reply #2 on: Jun 12, 2019, 09:28:38 AM »
Nice,  You should swap out your non vacuum axle disconnect to the new third assuming your was non.  Cleans things up a bit and easy to do.
Is it pretty much just pulling the vac modulator and putting a part off the other diff onto it?

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Pat

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Re: 4.88 gear swap in a 1994 pickup
« Reply #3 on: Jun 12, 2019, 09:30:23 AM »
You have to swap that complete tube where it mounts to the diff.  Yank the axle, and pull the tube.  Takes about 20 minutes
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MilesGC1999 [OP]

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Re: 4.88 gear swap in a 1994 pickup
« Reply #4 on: Jun 12, 2019, 09:32:52 AM »
You have to swap that complete tube where it mounts to the diff.  Yank the axle, and pull the tube.  Takes about 20 minutes
Alright thank you!

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OVRAROK

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Re: 4.88 gear swap in a 1994 pickup
« Reply #5 on: Jun 12, 2019, 10:36:19 AM »
Front diff covers are slightly different as well. If you have access to whole front diff, I would swap front cover, when you swap the tube. :yupyup:
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Pat

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Re: 4.88 gear swap in a 1994 pickup
« Reply #6 on: Jun 12, 2019, 10:52:59 AM »
All the ones I have done (including last years 4runner below)I didn't swap covers and everything was 100% perfect.  Frankly never even noticed a difference.

https://board.marlincrawler.com/index.php?topic=103248.0
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OVRAROK

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Re: 4.88 gear swap in a 1994 pickup
« Reply #7 on: Jun 12, 2019, 11:13:19 AM »
It was one the first things I noticed when I did this years ago. The ADD cover has the fill plug a little higher up then on non ADD  :usa:
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Pat

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Re: 4.88 gear swap in a 1994 pickup
« Reply #8 on: Jun 12, 2019, 11:31:55 AM »
Could be.  Would make sense they potentially be different since the ADD spins so much more.
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MilesGC1999 [OP]

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Re: 4.88 gear swap in a 1994 pickup
« Reply #9 on: Jun 19, 2019, 01:22:22 PM »
Ok I have the two front diffs apart. I have removed the add. Do I need to transfer the oil seal from the non add to the add diff? I'll attach pics.

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Pat

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Re: 4.88 gear swap in a 1994 pickup
« Reply #10 on: Jun 19, 2019, 01:23:23 PM »
Yep,  gotta make it all the same
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MilesGC1999 [OP]

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Re: 4.88 gear swap in a 1994 pickup
« Reply #11 on: Jun 19, 2019, 01:27:26 PM »
Yep,  gotta make it all the same
What's the best way to pull the seal without a seal puller?

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Pat

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Re: 4.88 gear swap in a 1994 pickup
« Reply #12 on: Jun 19, 2019, 01:32:20 PM »
I used a motorcycle tire tool.  The main thing is take your time and dont damage the sea.
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MilesGC1999 [OP]

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Re: 4.88 gear swap in a 1994 pickup
« Reply #13 on: Jun 19, 2019, 02:23:13 PM »
I used a motorcycle tire tool.  The main thing is take your time and dont damage the sea.
I got a seal puller and I cannot pull the seal. Which part am I pulling the rubber or the metal part.

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Pat

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Re: 4.88 gear swap in a 1994 pickup
« Reply #14 on: Jun 19, 2019, 02:39:41 PM »
Just the round rubber seal.
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Pat

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Re: 4.88 gear swap in a 1994 pickup
« Reply #15 on: Jun 19, 2019, 02:57:18 PM »
Just looked at pic on computer,  the metal outside section is part of the seal..
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MilesGC1999 [OP]

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Re: 4.88 gear swap in a 1994 pickup
« Reply #16 on: Jun 19, 2019, 03:29:45 PM »
I got it out and put the new diff together used rtv gasket for the first time lol. Shoukd be ready to install once my buddies get here with beer.

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Pat

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Re: 4.88 gear swap in a 1994 pickup
« Reply #17 on: Jun 19, 2019, 03:32:38 PM »
Perfect!!
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MilesGC1999 [OP]

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Re: 4.88 gear swap in a 1994 pickup
« Reply #18 on: Jun 19, 2019, 08:58:40 PM »
Great news. Got my front diff installed and torqued up in there.
I have scars to show for it too. My Jack smacked me hard in the forehead and split me open lol.
I got it all transferred into the new housing and cleaned. After that got a buddy and some beer and we got it installed in under 6 hours. Cant wait to test it out this weekend.



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Pat

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Re: 4.88 gear swap in a 1994 pickup
« Reply #19 on: Jun 19, 2019, 09:24:30 PM »
Good job,  show the scars man!!
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MilesGC1999 [OP]

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Re: 4.88 gear swap in a 1994 pickup
« Reply #20 on: Jun 19, 2019, 09:59:18 PM »
Got me good in the head man!

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Pat

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Re: 4.88 gear swap in a 1994 pickup
« Reply #21 on: Jun 19, 2019, 10:00:40 PM »
Ouch!!
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MilesGC1999 [OP]

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Re: 4.88 gear swap in a 1994 pickup
« Reply #22 on: Jun 21, 2019, 05:40:50 PM »
Pics of the new tires for my truck! Sorry for the snap filters.

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