The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 09-21-2024, 05:03 PM   #1
Sixball
Registered User
 
Join Date: Nov 2005
Location: Indiana
Posts: 97
Transmission or Rearend Problem?

I put a 454 and TH400 in my 94 Shortbed Standard Cab Chevy 1/2 Ton. Total computer delete. I also installed a Power Trax “lunchbox locker”. No issues for about 200 miles. Tuning the 454 and doing a few burnouts with no issues until last week. 3rd Gear take off from a dead stop, laid rubber for about 30 feet then the engine just revved while still moving forward. I let off the gas thinking I broke something but Truck continued moving forward. With my foot still off the gas, I hear the back tires catch like power was going to them, I slightly press the gas and it drove fine for the remainder of the trip ( 10 miles).

I checked the U Joint, no slop, tight bolts etc.. I drove another day about 25 miles, no hard acceleration. No issues until almost home and I felt a clunk - with the rear tires catching traction again while just driving normal at 30 MPH.

Where do I need to start looking? Rear end or Transmission?
Sixball is offline   Reply With Quote
Old 09-21-2024, 08:14 PM   #2
kwmech
Senior Member
 
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,631
Re: Transmission or Rearend Problem?

Definitely the rear axle. Those 10 bolts weren't very strong to begin with. Pull the cover and have a drain pan ready to catch the debris. Probably chipped a few teeth off the pinion and/or the ring gear
kwmech is offline   Reply With Quote
Old 09-22-2024, 07:53 AM   #3
Sixball
Registered User
 
Join Date: Nov 2005
Location: Indiana
Posts: 97
Re: Transmission or Rearend Problem?

Thanks. That’s what I suspected (rearend). What’s a suitable swap for the rearend? POSI in the Pumpkin? Or total axle swap?
Sixball is offline   Reply With Quote
Old 09-22-2024, 12:01 PM   #4
kwmech
Senior Member
 
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,631
Re: Transmission or Rearend Problem?

I'd recommend a 14 bolt semi-float that GM put in the trucks from 88-98? truck was the SS model that had a 454. Going to a little hard locating one that is 5 lug, but they're out there
kwmech is offline   Reply With Quote
Old 09-22-2024, 12:08 PM   #5
Sixball
Registered User
 
Join Date: Nov 2005
Location: Indiana
Posts: 97
Re: Transmission or Rearend Problem?

Quote:
Originally Posted by kwmech View Post
I'd recommend a 14 bolt semi-float that GM put in the trucks from 88-98? truck was the SS model that had a 454. Going to a little hard locating one that is 5 lug, but they're out there
Yeah, 6 Lugs are readily available, but I don’t want to switch wheels and brakes. The search is on.
Sixball is offline   Reply With Quote
Old 09-23-2024, 12:30 AM   #6
kwmech
Senior Member
 
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,631
Re: Transmission or Rearend Problem?

Quote:
Originally Posted by Sixball View Post
Yeah, 6 Lugs are readily available, but I don’t want to switch wheels and brakes. The search is on.
Maybe check on whether or not the 5 lug shafts will swap out for the 6, then either get the 5 lug drum or re-drill out the 6s.
kwmech is offline   Reply With Quote
Old 09-23-2024, 03:26 AM   #7
Ziegelsteinfaust
Registered User
 
Join Date: Dec 2012
Location: Temple City
Posts: 3,628
Re: Transmission or Rearend Problem?

5 lug 14 bolts are rare, and they don't make swap axles. Drill, and fill is an option.

So I suggest just doing the dirty, and go with a 33 spine 9".

Then while at it get it the exact width you want, and if so inclined. Disk brakes.
Ziegelsteinfaust is offline   Reply With Quote
Old 09-23-2024, 05:28 PM   #8
Sixball
Registered User
 
Join Date: Nov 2005
Location: Indiana
Posts: 97
Re: Transmission or Rearend Problem?

I’ve been looking around, and contemplating building my 10 bolt, but then considering the measurements and setup of the pinion etc.. I’m leaning towards a 3/4 ton 14 bolt as I can get one fairly easy.

Is this a bolt in option? I would then just need wheel adapters if I wanted to retain the 5 lug pattern? Whats involved in re drilling for 5 lug? Weld up and re drill? Is this a common practice?
Sixball is offline   Reply With Quote
Old 09-23-2024, 06:58 PM   #9
geezer#99
Registered User
 
geezer#99's Avatar
 
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
Re: Transmission or Rearend Problem?

Your description is more like trans problem.
Drop the pan and see what’s in it.
geezer#99 is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 11:32 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com