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Author Topic: trans or rearend??  (Read 10958 times)

Offline joesgarage71

  • Wrench
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  • Posts: 1156
Re: trans or rearend??
« Reply #15 on: December 27, 2010, 07:44:34 pm »
You may have 4:56 gears in the diffs. Or your not going 55. with 3:73 gears and 3000rpm will put you over 70mph or there abouts.
 Steve
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78' K-20 355/SM465/twin stick 205 6" on 36's
14 bolt FF/big bearing Dana 44 4.56 gears
92' GMC C-1500 454/4L80E/14 bolt

Offline jameswoodlee

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  • Posts: 40
Re: trans or rearend??
« Reply #16 on: January 01, 2011, 09:04:28 am »
Still working on it . The gears are 3.73's 100% sure.
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Wood

Offline thaiboxer04

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  • Posts: 10
Re: trans or rearend??
« Reply #17 on: January 05, 2011, 09:37:05 am »
I'm VERY interested to see what you find out as I have the same EXACT problem. 1974 k10 , 350ci, 373 gears, np203, 31" tires, runs well but at 2000+ rpms at 43-45 mph and its slow as a dog. I couldnt burn tire if my life depended on it. I just bought it recently and thought it would be much more powerful than this. It does shift through all gears but tranny may be slipping slightly, i cant tell. I will be starting a seperate thread though because it broke down this morning and wont move in gear. Makes a spline slip noise and just rolls even if in park.
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