View Full Version : What size diff gears ?

06-05-2014, 12:54 PM
I'm getting a new stall converter in a 6L80E from T.C.E and he's asking what size diff gears i'll be running. What i'm trying to find out is how many revs at 100kmh, the various size diff gears do.

06-05-2014, 05:14 PM
Would this help?


08-05-2014, 05:26 PM
First off don't know why this was posted here!

Secondly, no reply, oh well....

For fun :) I worked out the following on the GTS Gen F 6A:

1: 62.5983 KPH
2: 106.634
3: 165.626
4: 218.822
5: 295.872
6: 377.936

All speeds @6200RPM Diff 3.23 and 700.5 tyre diameter.

08-05-2014, 05:40 PM
Do you think it would have the pull in top gear to hit that speed?

08-05-2014, 05:49 PM
Theoretically yes!

Torque V's Drag maybe not :)

09-05-2014, 05:27 AM
Remember this though? 328 KPH, it is the 700hp Hennessey version and being a Camaro a little more streamline (***uming) then the GTS, but close to the above :)


09-05-2014, 11:55 AM
Thanks for that gear ratio calculator. Sorry if i wasnt supposed to post here , new member.
With the 4.11 diff gears, it will be doing just shy of 2200rpm. T.C.E want me ideally doing 2700rpm at 100kph, i do alot of freeway so i think we can compromise and meet at the 4.11 diff gears

09-05-2014, 09:31 PM
In 4th or 6th?
Anything shorter than 4.11's will make 1st gear absolutely useless!

15-05-2014, 12:56 AM
In 6th gear. Ive got a 239/254 632/595 114+3 cam but matched with the 452ci its not a huge cam . At 2000rpm the torque ramps up and basically flatlines till 4400rpm and it slowly declines . cant see the point in pulling 2700rpm cruising at 100.
. Im going for a quad clutch,lockup, 2500 stall its coming from the states with total 6l80e rebuild kit , billet shafts , billet planetarys, Alto steels and frictions. I tig welded 2 shafts here myself. When everything arrives will send all to get cryogenetically treated, housing as well. Cost is $650 for It to be done ,and will make it 15-25% stronger, so ive been told

15-05-2014, 09:34 AM
2500 should be plenty when you've got enough cubes behind it.

19-05-2014, 04:51 PM
That's about where I was thinking. What would anyone suggest for extractors, Ive got a hurricane ITB inlet manifold im going to stick on in another 1000ks and am looking for a set extractors 3" outlet 2'' primary. Have only got 1 3/4 primarys now while running in.
Does the forum organize any cruise days ?

19-05-2014, 05:27 PM
I think di filippo are the only ones that make 2" primaries. Otherwise 1 7/8" are available by loads of manufacturers.
Depending on where you are, some people have organised cruises before