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i'm going to be building a 68 2wd c10, and i have been all over reading and asking. so i thought i would start one up so that i and others could get a idea. i'm wanting more then a simple five speed. because this is going to be a 1/2 ton work truck but i want to be able to 55mph,65mph,80mph. and still be in the rpm range of 1750-2150. so i was wondering has anybody heard of or seen or done a c10 with a 4+3,4+4,5+2,5+4,6+2,6+4, twin stick transmission? they are in a lot of older 1.5 or 2.0 ton work trucks. any ideas on transmissions auto or manual would be great. i wanting at least a 6spd. any ideas on what mieage i would be looking at for a stock or slightly modified 4bt in 68 c10 with a what ever trans and a 12 posi rearend? any idaes would awesome i'm just a beginner.j
 

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need help.

i have more questions. do yall think that a trecmec TKO 5 speed (gm model) would hold up to a 4bt? they have to different strenths depending on what you want. the first weaker one is rated at up to 500ft.-lbs of torque the gear ratios are 1: 3.27 2: 1.98 3: 1.34 4: 1.00 5: 0.68 the stronger one is rated at up to 600ft.-lbs the ratios are 1: 2.87 2: 1.89 3: 1.28 4: 1.00 they have to options for fifth they are 5: 0.82 or 0.64 you can see the details at summitracing.com enter tko 5 speed transmission. the truck i am building is a c10 2wd i think that the gears are 3.73 in the rearend. what would i need to put this trany behind a 4bt? the transmission come with 26 spline input and a 31 output. any help would be great i am a beginner.j
 

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i have more questions. do yall think that a trecmec TKO 5 speed (gm model) would hold up to a 4bt? they have to different strenths depending on what you want. the first weaker one is rated at up to 500ft.-lbs of torque the gear ratios are 1: 3.27 2: 1.98 3: 1.34 4: 1.00 5: 0.68 the stronger one is rated at up to 600ft.-lbs the ratios are 1: 2.87 2: 1.89 3: 1.28 4: 1.00 they have to options for fifth they are 5: 0.82 or 0.64 you can see the details at summitracing.com enter tko 5 speed transmission. the truck i am building is a c10 2wd i think that the gears are 3.73 in the rearend. what would i need to put this trany behind a 4bt? the transmission come with 26 spline input and a 31 output. any help would be great i am a beginner.j
A stock 4BT yes, the 300 Ft-lbs of torque will hold up to that as a stock 4BT makes 282 ft-lbs of torque at the most. Now if you start modify that 4BT with bigger injectors, rebuilding the pump/replacing it with a bigger one, then you're going to need a beefier transmission.

I'm using a ZFS5-42 tranny from a 89 Ford pickup (5 speed) but my engine's staying stock at least for a while if not permanently. I was thinking of the Tremec T56 myself (for the double overdrive) till I found out how expensive they were.

Pantherman
 
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