Backlash in the Transaxle? - Page 15 - 3000GT/Stealth International Message Center

DoctorDex · 03-30-2008, 07:22 PM

Update: Got the transaxle back together (with the custom planetary dowel pins) and I installed some solid F/R motor mounts. The clunk has improved to some degree. It used to be a loud thud that would shake the car and you could feel it in your seat. Now it is less noticeable and I don't think it would bother me if I wasn't so sensitized to the problem. With that being said, I don't know if I'd recommend it as a worthwhile modification. It does take up some extra slack, however, I still have some slop in my transaxle and I think the only way to fix it is to buy a new one.

mateenvr4 · 04-04-2008, 12:08 AM

i had a problem like yours i replaced my motor with poly mount that i custom made. the front and back mounts cost me 50 and i can make one more.. i ordered a tube i belive it is 3.25 i remove the old rubber mounts and insert i had to light press it in because the stock mount are 3" and then i cut the rest off and drill the center and insert the round metal part after all that i don;t have no no clunk noise at all and i lunch my car all the time...i hope this help some one that don;t want to spend lots of money for the mount

flyman1981 · 04-04-2008, 06:33 AM

YOU DONT WANT TO KNOW WHAT A NEW PLANETARY GEARSET COSTS! I FRAGGED MINE AND ENDED UP BUYING A USED ONE.

HEre are some pics and illistrations of teh center diff, vcu and my F-up
Top This!!!

DoctorDex · 04-04-2008, 12:05 PM

mateenvr4: Did you replace the tranny & driver side mounts as well? I've replaced my F/R mounts with solids and it has minimally helped the clunk.

keithmac · 04-07-2008, 02:00 PM

I`ve got solids all round and have the clunk, having said that full solids are a worth while upgrade.

Did you take any pics while you were in the gearbox?.

DoctorDex · 04-07-2008, 02:45 PM

I have a couple of pics. Just haven't had chance to transfer them from my camera. Maybe I'll do that now....

DoctorDex · 04-07-2008, 03:12 PM

Tranny end cover off:

http://www.3si.org/forum/attachment....1&d=1207606223
DSC00087.JPG

Bar in the end of the intermediate shaft. Used to pry the gears away so you can get the VCU/planetary assembly out:
http://www.3si.org/forum/attachment....1&d=1207606223
DSC00088.JPG

Slide hammer, used to pull off the end cover (much easier than using blocks of wood and a hammer):
http://www.3si.org/forum/attachment....1&d=1207606223
DSC00089.JPG

DoctorDex · 04-07-2008, 03:17 PM

Bolts/springs/ball bearings that need to be removed to get the end cover off:
http://www.3si.org/forum/attachment....1&d=1207606452
DSC00090.JPG

VCU with Sun gear installed: http://www.3si.org/forum/attachment....1&d=1207606529
DSC00094.JPG

New custom "shouldered" VCU pin (left) and OEM pin (right):
http://www.3si.org/forum/attachment....1&d=1207606529
DSC00096.JPG

DoctorDex · 04-07-2008, 03:22 PM

Pics of the shouldered pins installed in the planetary gear set:
http://www.3si.org/forum/attachment....1&d=1207606755
DSC00100.JPG

VCU - sun gear - planetary gear set unit fitted together:
http://www.3si.org/forum/attachment....1&d=1207606755
DSC00103.JPG

Broken intermediate shaft oil guide (don't do this). I had a nightmare of a time trying to find a new/used one. It ended up costing me an arm and a leg: http://www.3si.org/forum/attachment....1&d=1207606755
DSC00107.JPG

DoctorDex · 04-07-2008, 03:27 PM

Like I said before, I can't say for sure if this was a worthwhile upgrade. I still do have a clunk and I can't say for sure if it was the motor mounts that helped or if it was the new pins. What I can say for sure is that it has taken up all slop between the planetary and VCU, which is how this part should have been designed in the first place.

If someone wanted to make their own, they'd need about 10 inches of 5/8'ths 4340 HTSR steel and they'd have to approach a machine shop with their parts in hand.

03-30-2008, 07:22 PM	#141 (permalink)
DoctorDex Forum Member Join Date: Jul 2005 Location: Edmonton, AB Drives: '91 VR4 - RIP Trader Rating: (13)	Re: Backlash in the Transaxle? Update: Got the transaxle back together (with the custom planetary dowel pins) and I installed some solid F/R motor mounts. The clunk has improved to some degree. It used to be a loud thud that would shake the car and you could feel it in your seat. Now it is less noticeable and I don't think it would bother me if I wasn't so sensitized to the problem. With that being said, I don't know if I'd recommend it as a worthwhile modification. It does take up some extra slack, however, I still have some slop in my transaxle and I think the only way to fix it is to buy a new one. __________________ '91 VR4 - Modlist: DR650R turbos, Snow stage 2D alky kit, DSM SMICs, blowthrough ported LT1 MAS, Dejon Tool intakes & y-pipe, Blitz DSBC Spec R, HKS SSQV BOV, PTE 580cc injectors, Dual feed fuel system with Aeromotive FPR & filter, Hotwired Supra pump, HKS DLI, MSD Wires, Apex'i S-AFC II, MAFTranslator, Turbobob ECU, Scanmaster III, LC-1 WBO2, ESP downpipe, Vac/EGR delete, Gutted precats and test pipe, Maximal solid mounts, 300m 18 spline output shaft, Centerforce Dual Friction clutch, RPS flywheel, GC coilover conversions with helper springs, Powerslot slotted rotors, Goodridge SS brake lines, Hawk pads (front), Stillen metal matrix pads (rear)

04-04-2008, 12:08 AM	#142 (permalink)
mateenvr4 Forum Member Join Date: Nov 2004 Location: Sterling Heights, MI Drives: 92 VR4, 91 CRX SI Trader Rating: (4)	Re: Backlash in the Transaxle? i had a problem like yours i replaced my motor with poly mount that i custom made. the front and back mounts cost me 50 and i can make one more.. i ordered a tube i belive it is 3.25 i remove the old rubber mounts and insert i had to light press it in because the stock mount are 3" and then i cut the rest off and drill the center and insert the round metal part after all that i don;t have no no clunk noise at all and i lunch my car all the time...i hope this help some one that don;t want to spend lots of money for the mount __________________ 1992 3000GT VR-4 Figi Blue 4-bolt main • 15g turbos • 550cc injectors • hotwired walbro 255 • front mount intercooler • spec stage 3 • stillen downpipe • 3" custom catback • ngk bcp7es .029 • intrax springs • apexi safc-2 • mbc • etc... 1/4 mile: 12.4 @ NG06 dyno: 320awhp @ 11psi before FMIC

04-04-2008, 06:33 AM	#143 (permalink)
flyman1981 Breaks all but Xfer case Join Date: Feb 2004 Location: Horseheads, NY Drives: 08 RAM HEMI, 93 VR-4 Trader Rating: (7)	Re: Backlash in the Transaxle? YOU DONT WANT TO KNOW WHAT A NEW PLANETARY GEARSET COSTS! I FRAGGED MINE AND ENDED UP BUYING A USED ONE. HEre are some pics and illistrations of teh center diff, vcu and my F-up Top This!!! __________________ Black 93 VR-4 12.60 @ 108 w/ 9b's, 550's BlowThrough MAFT and E-Manage 11.77 @ 123 w/ 14b's (22psi), FMIC, MAFTPRO, 650's ??.?? @ ??? w/ 14b's (26psi) ??.?? @ ??? w/ 14b's (24psi) + NOS (35shot) Show and Go: 98 rear garnish, EGR block off plates, Intrax, JayVR4 control arms, 1-4 Syncros, Kormex output shaft, RPS MAX Street Disc, Resurfaced Flywheel, ATR Downpipe, HKS SQV, Dejon dual intakes, AEM Wideband, mobo shift/ebrake boots, Battery Relocation, MAFT PRO, 14B Turbos, DNP TDO5 Headers, Tial Wastegates, DNP FMIC, P+P Heads, 99 Lifters, Vac Reduction, 98 Body kit, 94 Robot headlights, Ross Pistons, Balanced Crank, 720cc's, IPO FPR w/ Gauge, Flexalite fans, Boost a Pump, ARP Head Studs, CF 575 Hood, 50HP NX Wet Kit, NOCAR Xfer Case, Veilside CF spoiler, ACPT CFDS, 19x9 SSR D5R, Blitz SBC-ID, Prosport gauges, Boomslang harness, Corbeau LG1's, Yogurt's 4" cat-back, dual feed fuel system

04-04-2008, 12:05 PM	#144 (permalink)
DoctorDex Forum Member Join Date: Jul 2005 Location: Edmonton, AB Drives: '91 VR4 - RIP Trader Rating: (13)	Re: Backlash in the Transaxle? mateenvr4: Did you replace the tranny & driver side mounts as well? I've replaced my F/R mounts with solids and it has minimally helped the clunk.

04-07-2008, 02:00 PM	#145 (permalink)
keithmac Forum Member Join Date: Sep 2006 Location: YORK / UK Trader Rating: (1)	Re: Backlash in the Transaxle? I`ve got solids all round and have the clunk, having said that full solids are a worth while upgrade. Did you take any pics while you were in the gearbox?. __________________ JDM GTO TT, Emanage Blue - 450`s Hotwired Walbro - Gutted MAS - K&N Blitz SSBC - Aquamist Water Injection

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04-07-2008, 02:45 PM	#146 (permalink)
DoctorDex Forum Member Join Date: Jul 2005 Location: Edmonton, AB Drives: '91 VR4 - RIP Trader Rating: (13)	Re: Backlash in the Transaxle? I have a couple of pics. Just haven't had chance to transfer them from my camera. Maybe I'll do that now....

04-07-2008, 03:27 PM	#150 (permalink)
DoctorDex Forum Member Join Date: Jul 2005 Location: Edmonton, AB Drives: '91 VR4 - RIP Trader Rating: (13)	Re: Backlash in the Transaxle? Like I said before, I can't say for sure if this was a worthwhile upgrade. I still do have a clunk and I can't say for sure if it was the motor mounts that helped or if it was the new pins. What I can say for sure is that it has taken up all slop between the planetary and VCU, which is how this part should have been designed in the first place. If someone wanted to make their own, they'd need about 10 inches of 5/8'ths 4340 HTSR steel and they'd have to approach a machine shop with their parts in hand. Last edited by DoctorDex : 04-14-2008 at 04:53 PM.