Rear end knocking under Acceleration and upon Deceleration

StonecoreTx · 05-04-2010, 07:08 AM

I'm going to wait out on another subframe in better shape and reinforce it, I didn't realize how much crap that area of the subframe is... apparently it is a common problem for 2 key areas on the rear subframe 1.) right where the front diff mounting bolts and subframe meet 2.) above the diff where it connects to the driveshaft. everyone should go under the rear of their car if not already done so and check these areas of your subframe. I suspect that age and the more torque the diff puts more stress that causes these cracks.

I found tons of info and pictures in detail about this particular problem
http://www.supraforums.com.au/forum/...p?t-43162.html

TripleC · 05-04-2010, 01:03 PM

good plan on getting the new subframe. I will be doing the same time but in the mean time i am using what i have until i find one in my area.
If you had time and wanted a cage you should just try and build your sumframe into the cage. I know thats a big budget move but i dont know what kind of mechanic you are.
Weld it back together till you find yourself a new one, it takes hardly any time at all when you really think about it.

StonecoreTx · 05-12-2010, 06:06 PM

I'm not 100% sure if I want to repair my orig subframe or wait out of another one. My main concern is that maybe my subframe is twisted a bit and the front mounting bolt holes dont line up. =/ my crack is located right above the diff. seems like it's about to snap in half...

to weld or not to weld?

TripleC · 05-12-2010, 07:12 PM

Welding - not so much money (some would say free)
New Subframe - More money then welding ($150 -1500)

05-04-2010, 07:08 AM	#1
StonecoreTx Intake Join Date: Dec 2009 Location: Austin,Tx Posts: 41	I'm going to wait out on another subframe in better shape and reinforce it, I didn't realize how much crap that area of the subframe is... apparently it is a common problem for 2 key areas on the rear subframe 1.) right where the front diff mounting bolts and subframe meet 2.) above the diff where it connects to the driveshaft. everyone should go under the rear of their car if not already done so and check these areas of your subframe. I suspect that age and the more torque the diff puts more stress that causes these cracks. I found tons of info and pictures in detail about this particular problem http://www.supraforums.com.au/forum/...p?t-43162.html __________________ 86.5 mk3 supra 7mgte r154

05-04-2010, 01:03 PM	#2
TripleC 3" Exhaust Join Date: Nov 2009 Location: Fort Collins, CO Posts: 103	good plan on getting the new subframe. I will be doing the same time but in the mean time i am using what i have until i find one in my area. If you had time and wanted a cage you should just try and build your sumframe into the cage. I know thats a big budget move but i dont know what kind of mechanic you are. Weld it back together till you find yourself a new one, it takes hardly any time at all when you really think about it. __________________ 1JZGTE ,R154, Hallman Boost Controller, HKS bov, HKS Mushroom top Air Filter, HKS Front Mount Intercooler, Greedy Turbo Timer, PLX300 AFC, Custom Divorced Y-pipe, Custom Intercooler Pipeing, RS-R Concept Exhaust, Optima Red Top Battery, Strut bar Brembo Rotors, A1 Traction arms, Megan Coilovers, Stern ST 2 wheels rear 265x30 r19 - front 245x35 r19, New Front Lip, 18 x 8 and 18 x 9 MRR HR2 with whatever for Drift treads 2 additional C12A turbo's(Extra)

05-12-2010, 06:06 PM	#3
StonecoreTx Intake Join Date: Dec 2009 Location: Austin,Tx Posts: 41	I'm not 100% sure if I want to repair my orig subframe or wait out of another one. My main concern is that maybe my subframe is twisted a bit and the front mounting bolt holes dont line up. =/ my crack is located right above the diff. seems like it's about to snap in half... to weld or not to weld? __________________ 86.5 mk3 supra 7mgte r154

05-12-2010, 07:12 PM	#4
TripleC 3" Exhaust Join Date: Nov 2009 Location: Fort Collins, CO Posts: 103	Welding - not so much money (some would say free) New Subframe - More money then welding ($150 -1500) __________________ 1JZGTE ,R154, Hallman Boost Controller, HKS bov, HKS Mushroom top Air Filter, HKS Front Mount Intercooler, Greedy Turbo Timer, PLX300 AFC, Custom Divorced Y-pipe, Custom Intercooler Pipeing, RS-R Concept Exhaust, Optima Red Top Battery, Strut bar Brembo Rotors, A1 Traction arms, Megan Coilovers, Stern ST 2 wheels rear 265x30 r19 - front 245x35 r19, New Front Lip, 18 x 8 and 18 x 9 MRR HR2 with whatever for Drift treads 2 additional C12A turbo's(Extra)