Hey guys . Im excited about this and want your opinions . I was doing a little diging around and found that the 93 years t56 speed gearboxes came with slightly higher ratio 5th and sixth gears . Our fifth and sixth gears are .74:1 .50:1 . The 93 ratios are .80:1 .62:1 . On there own they dont seem like much of a jump but when combined with a gear out back I spent some time on the gear calculator and got this info

Acording to the gear calculator ( top speed @ 6000 in gear )

Rpm 1st 2nd 3rd 4th 5th 6th (mph)

6000 42 63 86 112 140 180 ( 4.10 with 93 ratios 5th 6th)

6000 50 75 103 134 181 268 ( 3.42 with stock 94 up t56 )

6000 42 63 86 112 151 223 ( 4.10 with stock 94 up t56 )

6000 46 69 94 123 153 198 ( 3.73 with 93 ratio 5th 6th)

I would like the 93 ratios 5th and sixth with 4.10's .This setup will be able to pull sixth as hard as fifth with the stock 3.42's ! Im going down to Benz transmissions to see how much it would cost to do the gear swap when the tranny is out ( clutch and flywheel this winter )

Im thinking this would be a very ballanced setup and still give great highway punch . So what do you think ??

 

just put 4.10s in ur car with ur T56 the way it is .... u'll love it

as far as i know (roy will chime in any minute now) .. the 93 T56s have differente 1st and 2nd gearing (way lower to compensate for 2.73s out back) and 3 and up are the same ...

 

'93's came with 2 different gear boxes

M28 M29 94+
3.36 2.97 2.66 1st gear
2.07 2.07 1.78 2nd gear
1.35 1.43 1.30 3rd gear
1.00 1.00 1.00 4th gear
0.80 0.80 0.74 5th gear
0.62 0.62 0.50 6th gear

Use these numbers in your calculator - you'll likely find that 4.10's on a m28 makes 1st really useless.

 

Great info

Heres what the guys posted on ls1.com in the ax rr forum .

In order to change one gear inside the tranny you have to change the cluster gear that interface's with it. So, you can get a tranny with the 93 ratio's or a tranny with the current ratio's but to mix and match you have to have a cluster gear that is made for those ratio's and I'm not aware of anyone who makes one with different then stock ratio's or a mixture of 93 and current ratio's.

Also

The '93 LT1 ratios are the same as the current ZO6

 

That is a huge waiste of time man!!!
It really won't make that much of a difference.
In the quarter mile you'll only reach 4th gear anyway, even with 4.10's. As for the highway, you'll miss having the .5-1 6th gear ratio.

 

93's 4th gear is the same 1,2,3,5,6 I belive is different.

 

Maybe but I like the idea of having the entire gearbox usable . . . .sixth gear sux right now and is overdriven to death . I never use it so if sixth was fifth and everything else was tighter that would make life fun Problem is I dont want 1 , 2 , 3 , 4 being too close , 4.10 would be the max gear id want out back with the current transmision ratios . . . . but that still leaves alot on the table with 5th and 6th ( 223 mph with 4.10's ) which is still useless . With a 180 mph redline in 6th I betcha you could climb that

 

get a 93 Transmission then if you go higher then, or go 4.56 problem with going over 4.10's is then your 10 bolt will be ultra weak!

 

Yeah ultra week and 1st and second will be not so good The 93 housing is supposed to be different . From what I read 94 - 97 are different than 98 - 02 also but they didnt get into spacifics as to what the differences where , just the outer shell I beleive . Someone has to make this stuff . . . Lou of Lg motorsports on ls1.com swaps his gear ratios in races so I posted in his thread and am waiting for a responce .
My buddie ordered a custom ratio richmond 6 speed for his mustang . . . . I may have to order up a whole new unit like he did . His 6th was something like .67:1 ( I beleive ) . That thing is going to hall some azz up top .

I wonder what it would cost to swap the brand new gutz from a 93 t56 into mine . . . . z06 ratios and then do a 3.73 or 4.10 out back . . .

 

http://www.rocklandstandard.com/TREMEC/T56.pdf

Just some pdf info .

 

you need to stop reading and just drive your car.
who races at 150 mph anyways? we don't have enough cars that would be geared for that that make enough hp

 

No way man, knowledge is key . Must be able to run turbo cars from a 100 mph punch just in case

 

Its the m29 tranny ratios that are the best ( found in the 93's with 3.23 rear gears ) as shown above .

Check this out !!

Rpm 1st 2nd 3rd 4th 5th 6th

5700 39 56 82 117 146 188 ( with 3.73 ring and pinion ) in mph

This would make for a bit stronger rear too . . . now to find a place that can rebuild my tranny with these gears

 

yeah the m29 would be the gear box to get if your going 4.10s. it will make the first gear real steep though, a former member transamtrav had 410s in his m29 and he was out of first pretty damn quick. i got the m28 and people recomend you dont go higher then 3.42s on it and usually most say no higher then 373s on the m29. so it will be up to personal choice, just hope your six speed doesnt turn into a five speed by making first gear useless just to make sixth gear usefull

 

1st should work well . As it is now 50 mph comes in first at 6000 rpm's with my transmission and 3.42 gears . With that m29 tranny and the 3.73 rear gear , 39 MPH comes @ 5700 rpm so 6000 would be a touch higher maybe 41 MPH . Thats plenty for me and the benifit up top will be killer !!

Also , with 4.10 gears in my existing setup , 1st gear @ 6000 rpm will only be 42 MPH Thats the same . I swear god himself built the m29 just for me