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Joined: 13 Jan 2009
Posts: 13

PostPosted: Tue Jan 13, 2009 4:50 pm    Post subject: Gears... Reply with quote

Ok i have a 1987 dodge daytona, i am under the impression it has a 1.04 or 1.06 gear ratio. it was also suggested to me to try a .91 gear ratio set. so w/ that wich one will turn more rpms?..and any clue where i can get a .91 set of gears?
The car will be a Whittemore Speedway car, 1/4 mile high banked.
Also found a place that makes racing wheels, they only make 13 and 15 for the car, the car currently has 14 inch wheels. So 13 inch or 15 inch we have a maximum 60 series tire rule..
any help and info would be great! Very Happy
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Joined: 27 Jul 2006
Posts: 192
Location: lansing

PostPosted: Tue Jan 13, 2009 9:47 pm    Post subject: Reply with quote

Heres a chart for you on all the different chrysler gear combinations.

Charts for determing gear ratio combinations for
front wheel drive Mopars with 413 type transmissions

NOTE: The transfer gears are located inside the cover
on the driver's side of the transaxle. The output gear is
towards the front while the driven gear is towards the
The pinion gear is on the end of the shaft that the driven
gear is mounted to. The pinion gear drives the ring gear
located inside the rear differential cover.

Available transfer gearsets:

ratio Output/driven teeth
0.91 57/52
0.96 56/54
1.04 45/47
1.06 53/56
1.22 49/60

Available ring/pinion gearsets:

ratio Pinion/ring teeth
2.86 21/60
3.05 20/61

Final drive ratio (in third gear):
(transfer x ring/pinion)

ratio combination
2.60 0.91/2.86
2.75 0.96/2.86
2.78 0.91/3.05
2.93 0.96/3.05
2.97 1.04/2.86
3.03 1.06/2.86
3.17 1.04/3.05
3.23 1.06/3.05
3.49 1.22/2.86
3.72 1.22/3.05

Transmission gear ratios:

ratio range
2.69 First
1.55 Second
1.00 Third

Combined available ratios:
(final drive x range selection)

ratio combination
4.03 2.60/Second
4.26 2.75/Second
4.30 2.78/Second
4.54 2.93/Second
4.61 2.97/Second
4.70 3.03/Second
4.92 3.17/Second
5.01 3.23/Second
5.41 3.49/Second
5.77 3.72/Second
7.00 2.60/First
7.39 2.75/First
7.47 2.78/First
7.88 2.93/First
8.00 2.97/First
8.16 3.03/First
8.53 3.17/First
8.70 3.23/First
9.39 3.49/First
10.01 3.72/First
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