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Corvettes[HELP!!]
Need answers QUICK! Ready to purchase TKO tranny...

FroDaddy
Senior
Member

480 posts [100%]
Green Cove Springs
FL

[HELP!!] Need
answers QUICK! Ready to purchase TKO tranny...

3:47
PM 4/8/2002

These questions are ones that I haven't been
able to find a straightforward answer for. I talked to my
mechanic today about the install, and he wants these answered.
Here we go!

- The crossmember has to be modified. What has to be done
to it? Move it further back as a rear mount for the tranny?
Some please explain in detail.

- The drive shaft has to be shortened. Exactly how much?

- What is the deal with the TKO shifter and the C3 center
console? What has to be done so the shifter will fit in the
stock location? Is there a bracket that someone makes so this
will be a bolt-on into a C3? Please be specific and give a
detailed explanation. I know a couple of members have
installed TKOs recently and can be thorough with a response.

- Will the GM modified TKO tranny bolt onto my centerforce
dual-friction clutch? What information do I need to provide to
get a definite yes or no?

- Kind of off the subject.. but is there such thing as a
3.07 posi-rear pumpkin?

I've done alot of research through the archives and these
topics are hazy at best. I'm ready to purchase, and am trying
to save time&money on the install by researching
everything before my mechanic and I begin the transplant.
Hopefully the forum will come through once again! (I haven't
been let down yet!)

Thanks for reading.

_______

'81 Vette:
The 61st born at Bowling Green

383 stroker plus other goodies
Desktop Dyno est.
470ft/lb@4500 on motor

zwede
Senior
Member

1919 posts [100%]
Plano TX

Re: [HELP!!] Need
answers QUICK! Ready to purchase TKO tranny...
(FroDaddy)

4:18
PM 4/8/2002

quote:

- The crossmember has to be modified. What has to be done to
it? Move it further back as a rear mount for the tranny?
Some please explain in detail.

The TKO tranny mount is further forward compared to the
TH400. Easiest way to adapt it is to buy the TH700R4 adapter
from http://www.bowtieoverdrives.com/ and weld it
to the front of the x-member. The TKO then bolts up. The
actual x-member stays where it is. If you have a stick shift
now you have to cut the x-member out and weld plates to it so
that it becomes removeable. If oyu have an auto it is already
removeable.

quote:

- The drive shaft has to be shortened. Exactly how much?

This should be measured on your particular car. It varies,
sometimes.

quote:

- What is the deal with the TKO shifter and the C3 center
console? What has to be done so the shifter will fit in the
stock location?

The TKO shifter comes out in the middle instead of the left
of the tranny.
You have to enlarge the hole in the tunnel.
Then, depending on the year of your car you either make a
offset mount (piece of aluminum with 2 drilled holes) to move
the shifter over to the left, or if there isn't enough room
you have to cut the shifter stub and re-weld it at a 60 degree
angle. Then cut and weld the shifter handle at the same 60
degree angle. The console does not have to be modified.

quote:

- Will the GM modified TKO tranny bolt onto my centerforce
dual-friction clutch? What information do I need to provide
to get a definite yes or no?

Sure will. Just make sure that the clutch is 26 spline.
Early 4-speeds were 10 splines. If your car is from the 70's
it should be 26 spline.

quote:

- Kind of off the subject.. but is there such thing as a
3.07 posi-rear pumpkin?

No, but there's a 3.08.

[Modified by zwede, 6:19 PM
4/8/2002]
_______

Markus Strobl

1971 Coupe, LS-5 454, Muncie M20 4-speed. 490 hp, 554
ft-lbs. Red on Saddle.
Edelbrock Aluminum heads, Roller
Cam, Super Comp Headers, Multipoint EFI, 17" Ralleys.
http://www.corvetteforum.net/c3/zwede

SteveG75
Senior
Member

892 posts [100%]
Middletown RI

Re: [HELP!!] Need
answers QUICK! Ready to purchase TKO tranny...
(zwede)

4:45
PM 4/8/2002

Just did a Tremec swap.

1. Mounting bracket.

Since you have a four speed (I assume since you mention a
clutch) you need to contact Bowtie Overdrives (www.700r4.com)
and get their 700R4 mount bracket that is designed to bolt to
the crossmember. It mounts the tranny mount a little further
back and down. With this bracket and Energy Suspension tranny
mount, it was a bolt in swap. I just had to eliminate the
exhaust hanger off the tranny for clearance.
The web site
only shows the crossmember which you need a removable one to
replace.

Since I installed the transmission and engine together, I
did NOT have to cut the crossmember. You can put them in
separately but you either have to (1) cut the crossmember or
(2) unbolt engine from mounts, move it forward enought for
clearance and then bolt it all back together.

2. Driveshaft. Mine was cut to 25 3/4" center-center of
U-joints. This was using the Forte's take apart yoke which you
need in ordeer to install the driveshaft. Cost me $123 for
shortening, balancing, and new U-joints.

3. Shifter. I had mine cut and welded. 2 1/4" to the left
and 1" back. My old Hurst stick was cut down and attaches with
bolts that are countersunk into the right side of the stick.
Cost $46 for the welding shop.

4. Clutch. You need a 26 spline unit which you SHOULD have
already.

P.S. On the tranny itself, there is a web on the bottom of
the tail housing that interferes with the crossmember. 10
minutes with a Sawz-All solves the proble.

Edit: Call Mike Forte at http://www.fortesparts.com/ . He is a
straight shooter and will give you the real info. Sine I am
only making about 410 ft-lbs of torque, he steered my into the
Tremec 3550 instead of taking my $$ for a TKO.

[Modified by SteveG75, 6:56 PM
4/8/2002]
_______

Steve G.

Was: Daily driven 1975 L-48/4spd/FE-7 convertible

Now: Daily driven 1975 355/5spd/FE-7 convertible

Current mods: Rebuilt L-48 (355), Performer RPM heads,
XE262 cam, 1.6 rockers, Edelbrock Performer 2101, rejetted and
recurved by Lars, true duals with Dynomax CeramaCoat headers,
Tremec 3550, BeCool radiator, Spal dual fans, '81 seats, TRW
spring, American Racing AR-136 rims 15x8

Plans:VB Performance Plus and Steeroids R&P kits, when
I am back out of the red.

Fevre
Senior
Member

466
posts [100%]
Ann Arbor MI

Re: [HELP!!] Need
answers QUICK! Ready to purchase TKO tranny...
(FroDaddy)

5:15
PM 4/8/2002

Any chance finding someone in your area that
has done it before? As with anything, the first time you do
something it is usual the worst.
_______

73 ragtop,
temporary 350, 4 spd, MSD 6A, ProBillet Dist, Holley 4150 600
with vac sec, Aluminum Trick Flow 23 dgr heads (waiting in the
wings), Weiand Stealth intake, 3.70 rear, Two Boxers (1 male
& 1 female) and no
money

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