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DoctorDex · 07-24-2006, 09:48 PM

I have a number of questions I'm hoping someone can answer

1. Does anyone know if it is as easy as it looks to swap the output shaft?

2. When one pulls the output shaft, how hard is it to get out the VCU and the planetary assembly? Can it be done without having to drop the entire transaxle?

Edit: Answer: Yes. The hardest part seems to be getting the case off of the transaxle. Need to take off a plate that has three little balls. However, still haven't figured out what this is yet.

I'm anxious to try the fix posted by Bret Brinkmann, but I'm a little worried that I'll get the whole thing apart only to find that my VCU is bad.

3. Can a VCU be tested, before pulling it out, to see if it works properly?
Edit: Answer (quoted from WoodroweBones):

Test #1:
Pull E-brake, put car in 1st gear and slip clutch a little. The car should dip in the rear and rise at the front

Test #2:
Hold 3 wheels and have someone try to spin the free rear wheel. Should be lots of resistance

Test #3:
With the rear tires on the ground and the front in the air try to spin both front tires in the same direction. Should resist.

4. What kind of symptoms will a bad VCU give, other than wheel spin?

I haven't been able to find anything about removing the VCU, but I have found some good how-to's regarding the output shaft:

Output shaft replacement without tranny pull: EASY
http://www.3si.org/wiki/index.php/Ch...e_transmission
http://hireznet.com/swap.htm
http://www.vr4stealth.com/output_shaft.htm
TC O.S replacement pics & tips
http://www.3si.org/forum/showthread...ht=output+shaft

Here's some good illustrative information on stealth316.com:

http://www.stealth316.com/2-awd3.htm#cdvcu

07-24-2006, 09:48 PM	#7 (permalink)
DoctorDex Forum Member Join Date: Jul 2005 Location: Edmonton, AB Drives: '91 VR4 - RIP Trader Rating: (14)	Re: Backlash in the Transaxle - VCU/Output Shaft? I have a number of questions I'm hoping someone can answer 1. Does anyone know if it is as easy as it looks to swap the output shaft? 2. When one pulls the output shaft, how hard is it to get out the VCU and the planetary assembly? Can it be done without having to drop the entire transaxle? Edit: Answer: Yes. The hardest part seems to be getting the case off of the transaxle. Need to take off a plate that has three little balls. However, still haven't figured out what this is yet. I'm anxious to try the fix posted by Bret Brinkmann, but I'm a little worried that I'll get the whole thing apart only to find that my VCU is bad. 3. Can a VCU be tested, before pulling it out, to see if it works properly? Edit: Answer (quoted from WoodroweBones): Test #1: Pull E-brake, put car in 1st gear and slip clutch a little. The car should dip in the rear and rise at the front Test #2: Hold 3 wheels and have someone try to spin the free rear wheel. Should be lots of resistance Test #3: With the rear tires on the ground and the front in the air try to spin both front tires in the same direction. Should resist. 4. What kind of symptoms will a bad VCU give, other than wheel spin? I haven't been able to find anything about removing the VCU, but I have found some good how-to's regarding the output shaft: Output shaft replacement without tranny pull: EASY http://www.3si.org/wiki/index.php/Ch...e_transmission http://hireznet.com/swap.htm http://www.vr4stealth.com/output_shaft.htm TC O.S replacement pics & tips http://www.3si.org/forum/showthread...ht=output+shaft Here's some good illustrative information on stealth316.com: http://www.stealth316.com/2-awd3.htm#cdvcu __________________ '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) Last edited by DoctorDex : 07-24-2006 at 11:37 PM.