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08-04-2015, 12:34 PM | #1 |
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Rear End Gear Ratio for T5 Transmission?
I installed a T5 transmission from a 1987 Chevy S10 in my Town Sedan. Overall I'm quite happy with it. However, 1st is very low. In fact I feel all the gears might benefit from a better rear end gear ratio but I'm not sure what gears would be best. I currently have a the stock 3.78 gears. I would appreciate any thoughts on this matter.
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08-04-2015, 01:20 PM | #2 |
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Re: Rear End Gear Ratio for T5 Transmission?
A lot is going to depend on what you have for a motor. For a stock rearend you have a 3.54, a 3.27 and a 4.11 available, other than your 3.78.
In theory you can divide the ratios and find the reduction in RPM you will get for a given speed, but you eventually get to the point where the motor cant pull the taller gear. Good Luck |
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08-04-2015, 02:07 PM | #3 |
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Re: Rear End Gear Ratio for T5 Transmission?
I believe there are many diff tranny ratio's available also. You might try asking this on the HAMB or the EV8 forum. It may not be your rear end ratio.
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08-04-2015, 02:09 PM | #4 |
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Re: Rear End Gear Ratio for T5 Transmission?
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08-05-2015, 06:27 AM | #5 |
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Re: Rear End Gear Ratio for T5 Transmission?
Thanks to everyone for the feedback. I have a rebuilt, stock engine. I currently have a 3.78 rear. I have identified my transmission gear ratios from the chart:
3.39 3.50 2.14 1.39 1.00 0.78. The car runs fine, have had it up to 60 mph, no problem, but 1st is very low, 4th seems to be needed a bit early. With all this info., how do I proceed. Perhaps a 3.54 rear end ratio would be helpful? Or maybe just leave it alone? |
08-05-2015, 07:06 AM | #6 |
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Re: Rear End Gear Ratio for T5 Transmission?
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08-05-2015, 07:14 AM | #7 |
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Re: Rear End Gear Ratio for T5 Transmission?
Why did you change it in the first place ? Wayne
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08-05-2015, 08:25 AM | #8 |
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Re: Rear End Gear Ratio for T5 Transmission?
well the t5 in my 4 banger 95 s10 your shifting every 10mph increase in speed. thats with the factory s10 ratio of 3.73.
you have a truck transmission which i feel is better in a model A due to its power to weight ratio. I dont think you would be happy if you had a t5 out of a camaro or something sporty.
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08-05-2015, 08:39 AM | #9 |
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Re: Rear End Gear Ratio for T5 Transmission?
I have a banger with a t-5 . tried 3.54 but still to low . I just installed 3.27 hoping to help 1st gear ................ my t-5 is a 0.78 I believe .
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08-05-2015, 10:25 AM | #10 | |
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Re: Rear End Gear Ratio for T5 Transmission?
Quote:
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08-05-2015, 11:44 AM | #11 |
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Re: Rear End Gear Ratio for T5 Transmission?
Ron-5th gear is fine 60 -65 mph, and doesn't seem to want anything more.
As you said, maybe I'll just leave it. I'm guilty sometimes of seeking perfection. V4F-please let me know how the 3.27 performs. When I look at the description of the 3.27 gears in the Model A vendor catalogs it always states: "must have a strong engine". What does that mean? Is a rebuilt stock engine, stock head strong enough? katy-2nd is ok on perfectly flat ground, but the slightest incline and it's "boggy". |
08-05-2015, 11:52 AM | #12 |
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Re: Rear End Gear Ratio for T5 Transmission?
I'm using the T-5 from a Chevy truck with a B engine equipped with a CRAGAR head, headers, etc. the rear end is 3:54. Add an F-100 steering box and yopu have the perfect touring car
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08-05-2015, 04:02 PM | #13 |
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Re: Rear End Gear Ratio for T5 Transmission?
T5 first gear of 2.95 is about ideal, just slightly taller than stock.
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08-05-2015, 06:05 PM | #14 | |
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Re: Rear End Gear Ratio for T5 Transmission?
Quote:
More of a HAMB question. There's lots there about T5's. |
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08-05-2015, 06:28 PM | #15 |
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Re: Rear End Gear Ratio for T5 Transmission?
Don't forget: tire size also makes a big difference!
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08-06-2015, 04:46 AM | #16 |
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Re: Rear End Gear Ratio for T5 Transmission?
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11-20-2020, 07:32 PM | #17 | |
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Re: Rear End Gear Ratio for T5 Transmission?
Quote:
OR....... You can swap the NWC Camaro main shaft with the S-10 main shaft, assemble the trans normally using the Camaro gear set, and the speedo will work as is. The Camaro gears are completely interchangeable with the S-10 main shaft. Now, you have a great gear ratio (2.95 1st gear), including a close-ratio gear set that shifts wonderfully, and a .63 OD ratio. The ONLY reason you ever need anything "S-10" is for the tail shaft housing and shift lid which moves the shifter farther forward. The S-10 gear sets SUCK hugely! But, then again, this is a five year old thread! DD |
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11-21-2020, 12:02 AM | #18 |
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Re: Rear End Gear Ratio for T5 Transmission?
When looking for a 5 speed trans. I wanted an s-10 because of the shifter location. A trans out of a 4-cyl has a low 1st gear and a not too tall 5th gear which is what I wanted. Could not find one in So Cal that was not over $800 (Hot Roders love these transmissions) Did find a very good trans out of a V6. Changed the diff. to 4.10. The low 1st is for parade use and a close to stock engine can pull 5th gear. Very happy with that combination.
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11-21-2020, 01:19 AM | #19 | |
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Re: Rear End Gear Ratio for T5 Transmission?
Quote:
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11-21-2020, 11:45 AM | #20 |
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Re: Rear End Gear Ratio for T5 Transmission?
My Vicky has an S-10 trans. w/the 4:1 1st gear and 26% OD and a 4.10 rear end. I normally start in 2nd gear and with the 26% OD, it is great on the highway. I do use first when starting on a hill, and when hill-climbing.
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