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09-21-2024, 05:03 PM | #1 |
Registered User
Join Date: Nov 2005
Location: Indiana
Posts: 97
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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? |
09-21-2024, 08:14 PM | #2 |
Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,635
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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
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09-22-2024, 07:53 AM | #3 |
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Join Date: Nov 2005
Location: Indiana
Posts: 97
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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?
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09-22-2024, 12:01 PM | #4 |
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Join Date: Mar 2003
Location: Colfax-California
Posts: 8,635
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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
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09-22-2024, 12:08 PM | #5 |
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Join Date: Nov 2005
Location: Indiana
Posts: 97
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Re: Transmission or Rearend Problem?
Yeah, 6 Lugs are readily available, but I don’t want to switch wheels and brakes. The search is on.
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09-23-2024, 12:30 AM | #6 |
Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,635
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Re: Transmission or Rearend Problem?
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09-23-2024, 03:26 AM | #7 |
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Join Date: Dec 2012
Location: Temple City
Posts: 3,628
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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. |
09-23-2024, 05:28 PM | #8 |
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Join Date: Nov 2005
Location: Indiana
Posts: 97
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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? |
09-23-2024, 06:58 PM | #9 |
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Join Date: Aug 2009
Location: Bowser
Posts: 13,733
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Re: Transmission or Rearend Problem?
Your description is more like trans problem.
Drop the pan and see what’s in it. |
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