C6 rpm levels......

motoxscott

Well-Known Member
Posts
1,240
Reaction
299
I'm sure their is a formula to figure this out but I'm hoping someone already know this.

'93 F-150 with 5.8L(351W)

If I run 37" tires with 4.88 gears what kind of rpms can I expect out of a C6 transmission not having overdrive anymore? Where is this thing gonna top out at you think?

(examples)
60 mph = 3,000 rpms
75 mph 4500 rpms

Thanks,

-Scott
 

heavy8

Well-Known Member
Posts
78
Reaction
0
your trans should be 1:1 ratio 3rd gear.
100=4431
85=3766
75=3323
65=2880
5000rpm=112mph
this will be slightly off since a 37in tire is not truly 37"
check out www.4lo.com
4.88 looks like a good set up..
 

Chris_Wilson

Well-Known Member
Posts
3,283
Reaction
1,313
Actual revs will be higher since the C6 does not have a lock-up converter, right?
 
Posts
7,201
Reaction
3,508
Some Standard Gear Ratios

These are some standard gear ratios for various American Transmissions. The attachment is an Excel Spreadsheet that I developed for comparing transmissions and gear ratios. It shows the theoretical speed in each gear at 500 Rpm increments for a given tire diameter and R/P. The red cells can be edited to try different combinations and the graphs give a visual indication of the results. Tell me what you think of the tool, I've been using it for years and think it helps.

American Transmission Gear Ratios

Standard transmission ratios:

Richmond Gear R.O.D. (Richmond Overdrive) 6-spd manual

3.27, 2.13, 1.57, 1.23, 1.09, 0.76
4.06, 2.22, 1.57, 1.23, 1.09, 0.81 (optional 0.88)
3.01, 1.88, 1.46, 1.19, 1.09, 0.62

Richmond Gear T10 4-spd manual
2.43, 1.61, 1.23, 1.0 PN: 13040000070
2.64, 1.75, 1.34, 1.0 PN: 13040000069
2.64, 1.60, 1.23, 1.0 PN: 7021090
2.88, 1.91, 1.33, 1.0 PN: 13040000072

Richmond Gear (Doug Nash) 5-spd manual
3.27, 2.14, 1.57, 1.23, 1.00

Borg Warner T56 6-spd manual
3.36, 2.07, 1.35, 1.00, 0.80, 0.62

Ford Mustang 5.0l
5-spd manual1986-1988
3.35, 1.93, 1.29, 1.00, 0.68

1989-1994 5-spd manual
3.35, 1.99, 1.33, 1.00, 0.68

Borg Warner Close Ratio T-5
2.95, 1.94, 1.34, 1.00, 0.63 (0.80 optional)

Tremec 5-spd manual (aftermarket)

3.27, 1.98, 1.34, 1.00, 0.68 Model: 3550
3.18, 2.06, 1.39, 1.00, 0.65 Model: 3750S

ZF 6-spd manual (Used in '93-up Corvettes, including ZR-1)
2.68, 1.80, 1.31, 1.00, 0.75, 0.50

AUTOMATIC TRANSMISSIONS:

Power Glide 2-spd Automatic
1.82, 1.00
1.76, 1.00

Ford C-4 3-spd automatic
2.46, 1.46, 1.0

Ford C-6 3-spd automatic
2.46, 1.46, 1.0
2.71, 1.54, 1.0 Wide Ratio

Ford AOD 4-spd automatic
2.40, 1.47, 1.00, 0.67

AOD Wide Ratio 4-spd Automatic
2.84, 1.55, 1.00, 0.67

Ford AL4D (1987-1989) 4-spd automatic
2.47, 1.47, 1.00, 0.75

Ford E4OD 4-spd electronic automatic
2.71, 1.53, 1.00, 0.71

TH-350
2.52, 1.52, 1.00

TH-400
2.48, 1.48, 1.00

TH-700R4/4L60E (1991 Chevrolet)
3.06, 1.62, 1.00, 0.70 rev-2.29

4L80E
2.48, 1.48, 1.00, 0.75

200-4R (GN, Buick Regal,Cutlass,V6 F-body, etc)
2.74, 1.57, 1.00, 0.674
 
Top