Rear End Gears

[meissen]

http://www.f-body.org/gears/

1st gear with a 4.10 at 5700rpm is 40mph.

6th gear with a 4.10 at 70mph is 1900rpm.

Damn - in my 2012 1st gear at 5700rpm is like 15mph...

[JoeliusZ28]

Compare 6th gear of a T56 to 4th of a 60e. .5 vs .69. Overdrive in the 60e is pretty close to 5th in the T56.

For some reason i thought 4th was 1:1 on a T56??

[JoeliusZ28]

Nevermind i read your post wrong. You can compare 4th gear in a t56 and 3rd in a 60e since they are both 1:1

2.66---1.78---1.30---1.00---0.74---0.50

1:1 in a 4L60e is 3rd

[ruckusz28]

Go big! I ran 3.73's on my old 4th gen and wished I had gone to a 4:10 instead.

[1BADAIR]

early t56 6th are .62

[QuickTop]

now how bad are 4:11's going to screw with my idea of having a low end powered car.

[Boost Addict]

now how bad are 4:11's going to screw with my idea of having a low end powered car.

If you can drive a T56 they will do nothing but help you

[QuickTop]

Rear End Gears

It'll be my first 6 speed car.. I've only driven 5 speeds.

[hoogiesngrinderz]

It'll be my first 6 speed car.. I've only driven 5 speeds.

Final drive doesn't change much, just adding a gear.

First gear ratio is what you want to watch out for. Early v8 T5's had a lower 3.35 gear (if I remember right) and wasn't so bad with 3.08 or 3.23, but 3.42's were on the verge of having a quick 1-2 shift. Later T5's worked well with 3.73 because of a 2.95 first gear.

Rule of thumb says that staying close to 11:1 or less in 1st is ideal for street use. Early T56 had 2.97 1st gear ratio and with a 4.11 rear would put you at 12.2, while a later T56 with the 2.66 1st would be 10.93

[hoogiesngrinderz]

It'll be my first 6 speed car.. I've only driven 5 speeds.

Final drive doesn't change much, just adding a gear.

First gear ratio is what you want to watch out for. Early v8 T5's had a lower 3.35 gear (if I remember right) and wasn't so bad with 3.08 or 3.23, but 3.42's were on the verge of having a quick 1-2 shift. Later T5's worked well with 3.73 because of a 2.95 first gear.

Rule of thumb says that staying close to 11:1 or less in 1st is ideal for street use. Early T56 had 2.97 1st gear ratio and with a 4.11 rear would put you at 12.2, while a later T56 with the 2.66 1st would be 10.93

[93formulalt1]

Final drive doesn't change much, just adding a gear.

First gear ratio is what you want to watch out for. Early v8 T5's had a lower 3.35 gear (if I remember right) and wasn't so bad with 3.08 or 3.23, but 3.42's were on the verge of having a quick 1-2 shift. Later T5's worked well with 3.73 because of a 2.95 first gear.

Rule of thumb says that staying close to 11:1 or less in 1st is ideal for street use. Early T56 had 2.97 1st gear ratio and with a 4.11 rear would put you at 12.2, while a later T56 with the 2.66 1st would be 10.93

It should be noted that the 2.66 1st gear ratio applies to F-Body T56's '94+, the '93 model year had two different iterations of the T56, the first gear ratios being 3.36 and 2.97. These were M28 and M29 T56's.

[hoogiesngrinderz]

It should be noted that the 2.66 1st gear ratio applies to F-Body T56's '94+, the '93 model year had two different iterations of the T56, the first gear ratios being 3.36 and 2.97. These were M28 and M29 T56's.

Good info! Wasn't sure of the years, haven't rebuilt one yet so my knowledge is limited on that trans

[QuickTop]

Good info! Wasn't sure of the years, haven't rebuilt one yet so my knowledge is limited on that trans

im pretty sure its a 94+ if memory serves me right its from a 96 WS6.
Also are these a good set to go with ?
http://www.summitracing.com/parts/sag-g75411/overview/
EDIT: i cannot find any 4.11's for a series 2 7.5

[Nocooler]

How hard are you going to be on it?

I'd run a 3.90 gear - many have had better luck with them lasting in a 10 bolt. They are much stronger compared to the 4.10's.

[QuickTop]

I wouldnt say hard at all, maybe once a week i get on the gas a little have some fun on the street but not much over 1/2 throttle.