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Discussion Starter · #1 · (Edited)
Please rtefresh my memory on finding gear ratio, I rotate the hub 1 revolution and the diff. rotates just ove 3 time. By just ove 3 is it is at the 1 o'clock postion. Rotating the hub 2 revolution brings spins the differential 6 times and to the 2 o'clock postion. 3.07's ??
 

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Discussion Starter · #3 ·
Thanks, I was hoping for a deeper number I'll see how the 3:07's work out. I'll hold off on the wheelie bars for now:D
 

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Discussion Starter · #7 · (Edited)
GM T-56 SIX SPEED FOR 1998 TO 2002 REPLACEMENT
P/N 12552099​
This six-speed transmission is similar to part number 12558016 above with the same gear ratio. Due to changes to the housing, etc., the parts list above will not work with this transmission. No picture is available. 1998 to 2002 replacement, fits LS1 engines.
T-56 Transmission Specifications​
Gear ratios:
2.66:1 first, 1.78:1 second, 1.30:1 third, 1.00:1 fourth, .74:1 fifth, .50:1 sixth, and 3.28:1 reverse.
Torque capacity: 450 lb-ft.
 

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Discussion Starter · #8 ·
With this gear ratio what would you think the in the seat off the line and top end should be like? Do you know of a link where I can figure RPM at say 80 mph with a 26'' tire
 

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Discussion Starter · #9 ·
looks like 1587 rpm @ 80 mph. :rolleyes: I think I'll have to cruise faster or try a deeper gear ratio. Hey wait, I could down shift and few gears :cool:
 

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Discussion Starter · #13 ·
I can't open your site out here in the shop. Dose it specify an estimated top speed?
 

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Discussion Starter · #14 ·
I'm thinking 3.42's, @ 85 mph 1878 rpm. 4.10's @ 2252 rpm.

Oh this Dana 44 I am putting in is 1'' narrower. I/2'' more clearance on each side could solve or at least improve my rear wheel removel delema
 

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Gear Ratio Final MPH @ 6,500 RPM RPM @55 MPH
1____2.66__8.17_________63.3__________5645
2____1.78__5.46_________94.6__________3777
3____1.30__3.99________129.6__________2759
4____1.00__3.07________168.5__________2122
5____0.74__2.27________227.7__________1570
6____0.50__1.53________336.9__________1061
R____2.90__8.90_________58.1__________6154
Axle ratio 3.07
Wheel diameter 26.0 inches
 

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A55C4 said:
Please rtefresh my memory on finding gear ratio, I rotate the hub 1 revolution and the diff. rotates just ove 3 time. By just ove 3 is it is at the 1 o'clock postion. Rotating the hub 2 revolution brings spins the differential 6 times and to the 2 o'clock postion. 3.07's ??

I do it a little differently. Rotate the driveshaft ( counting turns ) until a helper says the rear tire makes ten revolutions.

30 turns = 3.00
35 turns = 3.55
41 turns = 4.11

I'd shoot for 1800 rpm at 60 mph.
 

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Discussion Starter · #17 ·
Help:confused:

I think I will do a gear change before I put it all back together.Any sugestions. MPG's are good but I don't think I'd ever use 6th gear and if I'm not in the power curve mpg's would suffer. I don't want to go to deep that I have to use second gear to take off in traffic. Guess what I'm saying is I don't what a Granny gear.
 

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Discussion Starter · #19 ·
Bama57 said:
I do it a little differently. Rotate the driveshaft ( counting turns ) until a helper says the rear tire makes ten revolutions.

30 turns = 3.00
35 turns = 3.55
41 turns = 4.11

I'd shoot for 1800 rpm at 60 mph.
I'll try your way also. It all out and real easy to rotate and couont. I know the 3.08's were a common rato in the Vettes. I find it odd that the Dana 36 from and auto car and the Dana 44 from a 5 speed Vette would have the same ratio
 
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