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11-21-2010, 01:58 AM
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#1 |
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Registered User
Join Date: May 2008
Location: greenville Alabama
Posts: 63
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1983 c10 rearend
What's all. i just installed a 400 tranny behind my 283 small block.
my rear end is holding me back. i want better hywy mileage. Which rearend shoul i install? Thanking all in advance.
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 Country; LIKE A ROCKAll that I am, I owe 62SWB-STEP 83SWB 86LWB |
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11-21-2010, 02:06 AM
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#2 |
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Happy to be here
 
Join Date: Mar 2000
Location: Cypress, TX
Posts: 39,021
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Re: 1983 c10 rearend
What gear do you have now?
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Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra" |
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11-21-2010, 02:14 AM
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#3 |
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Registered User
Join Date: Apr 2005
Location: Austin, TX
Posts: 1,223
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Re: 1983 c10 rearend
If you are so concerned with gas mileage, why did you install a TH400? That is probably the worst transmission, other than a powerglide, as far as gas mileage is concerned. With a 283, you should have been looking for a 700r4 transmission. Better 1st gear ratio for performance plus an overdrive gear for mileage.
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- Greg Last edited by 454HO; 11-21-2010 at 02:18 AM. |
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11-21-2010, 05:41 AM
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#4 |
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Registered User
Join Date: May 2009
Location: Sparks, NV
Posts: 913
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Re: 1983 c10 rearend
agreed.
your 283 paired with a 700r4 and running some 3.42 gears would definitely give you some decent gas mileage. (for a truck)
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Greg 1974 GMC 1/2 Ton SWB Fleetside L33 5.3/4l65e .................__
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11-21-2010, 04:40 PM
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#5 |
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Account Suspended
Join Date: Dec 2008
Location: indisclosed
Posts: 1,515
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Re: 1983 c10 rearend
Also, it would be easier and cheaper to play with rear tire sizes and brands in order to get the right rpm for highway cruising.
Alum wheels and brake drums would also be beneficial. |
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11-22-2010, 12:06 AM
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#6 |
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Registered User
Join Date: May 2008
Location: greenville Alabama
Posts: 63
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Re: 1983 c10 rearend
Thanks for the response. Intially i was running a th-350 (until it died on me). i couldn't afford to rebuild it right now. The th-375 is my stand-by tranny, so i decided to install the th-375. i'm not certain of which gears i have now, i do know it's a posi. I'm currently running a set of 255/60r-15.
Should i change the rear gears to 3:7x or lower and/or install another tranny or keep what i have? Thanking your in advance.
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Country; LIKE A ROCKAll that I am, I owe 62SWB-STEP 83SWB 86LWB |
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