My ZF6 is getting worse... the syncros are going and 3rd is grinding worse and worse lately..

I have seen some NEW ZF6 trannies on ebay for around $2000-$2500, but they say they are for ZR1's LT1's and LT4's and stuff.

My question is: Is this the SAME transmission as in my '89? or is the ZF6 different for the other cars?

I will most likely be purchasing a new one or rebuilding the old one in the next year, but I am starting to shop now.

 

You have a "Black tag" ZF-6 speed They are a little stronger but more louder than the "Blue tag" ZF's Eather will work. The only thing you cant use is a ZR-1 ZF they have longer input shafts. (the ZR-1 shaft is around 6 inches and the LT/ L98 series are about 5 1/2 inches if I rember correctly.

 

ahh ok... so i should be safe with any of the "lt1/lt4" ZF trannies, just NOT a ZR1 correct?

 

You might call http://zfdoc.com/ to see about getting it fixed first.

 

Correct,

The main diffrence between the black tag and Blue tag is Black is rated at 450ftlbs and the blue is at 400ftlbs.

ZF docs and white racing charge about 2500 for a basic rebuild. The main reason is because the only company that makes bearings for our trans is ZF they charge $700 for just the bearings! that doesent include syncros, gears, shafts or shift forks if needed.

If you can find a new trans for $2,000. you are way ahead!

If you want a seriously beefed up gear box ZF doc's will cryo all the parts and weld 2nd gear to the shaft. A very stout box.

By the way I bought a Brand new ZF this past July for $1600.

 

Try them -


http://www.rsgear.com/

 

Check your clutch fluid level. Leading cause of wear on synchros and hard shifting.

 

I agree!

 

I'd try a new master & slave first if they are original. $200. of parts. I did my slave last weekend & improved shifting very noticably. I'm doing the master next.

55k miles on mine.

 

I bought a new one from them in April. They advertise $2800 now in some mags.

 

I contacted Bill at www.zfdoc.com for a rebuild estimate - his special superduper rebuild is 2800.00. It is VERY thorough.

 

brand new ZF

www.gmpartsdirect.com

$1800 + shipping

Larry,

I tried to send you the article on 4+3 conversion.

Did you receive any of it?



To go through a working ZF S6-40 would be:

Labor - $900

Rebuild kit - $100

Synchronizer Kit - $500

Bearing Kit (if needed) - $600

Misc. shifter components - $75 to $250 if adding a short-shift lever

Additional parts may be required upon internal inspection of transmission (this is the part that usually shocks the customer the most).



Bill Boudreau

ZR51 Performance






--------------------------------------------------------------------------------

From: Larry Dickey [mailto:larry@dickey.com]
Sent: Monday, June 28, 2004 11:47 AM
To: billb@zfdoc.com
Subject: RE: 4+3



Hey Bill:


What is the cost for you to go thru a working ZF, 1992?



Still $2800?



Regards,

Larry Dickey

INDY




--------------------------------------------------------------------------------

From: Bill Boudreau [mailto:billb@zfdoc.com]
Sent: Thursday, June 17, 2004 2:38 PM
To: 'Larry Dickey'
Subject: RE: 4+3



Larry,

The other items that you will need are covered in the article that I have attached.



Bill Boudreau




--------------------------------------------------------------------------------

From: Larry Dickey [mailto:larry@dickey.com]
Sent: Wednesday, June 16, 2004 7:16 AM
To: billb@zfdoc.com
Subject: RE: 4+3



Hey Bill:



If I got to the ZF, can it handle 405RWTQ and what else is needed to do the swap, can I use my flywheel etc?



Larry Dickey

INDY




--------------------------------------------------------------------------------

From: Bill Boudreau [mailto:billb@zfdoc.com]
Sent: Monday, June 14, 2004 9:17 PM
To: 'Larry Dickey'
Subject: RE: 4+3



Hi Larry,

Sorry it took so long to reply, been very busy lately which is a good thing.



GM is clearing out the last of their ZF S6-40 transmissions from inventory.



If you are at all serious about converting over to the ZF S6-40, I strongly recommend that you contact your local GM Parts

Department and purchase one of these transmissions a.s.a.p. P/N 12455189 (ZF S6-40 540Nm).

It has been 4 weeks since the GM’s clearance price sale began and from what I’ve heard, there are currently less than 70 of 400 units left in stock.

GM is selling these units to the dealer for an incredibly low price of $1800 new complete with shifter. That is $2800 less than what they normally sell for.



Converting your 4+3 to a ZF S6-40 is the best way to go.



Regards,

Bill Boudreau

ZR51 Performance

Cave Creek, AZ

(602) 319-6575

 

woah... thanks guys...


Hrmm i think ill give GM a call and see if they have any on clearance then LOL

if not, ill give the ZF dude a call about the super duper beefing up thing...

 

What is the part number for this? I couldn't locate one and their website sucks for searching.

 

The later 93+ versions will have a smaller O.D. input shaft, and thus will require the smaller throw out bearing. No big deal.

 

its in the post above

# 12455189

 

that rsgear place in NY is becoming popular. my friend just had his Z06 tranny rebuilt there.