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04-24-2009, 07:36 AM | #1 |
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69 chevy tanny ratios?
hi im new to the board, happy to find this out there. i have a 69 chevy c10 pickup that my grandfather bought new and has since been passed down. it is a typical work truck and will need a bit of help but im up for the task. i have a few questions.
it is a 292 with a 4 on the floor, what transmission code is it, and what are the ratios? it also has an 8 lug rear end, is that stock, what final drive ratio is in the rear end? lastly what is the curb weight of the truck? thanks -jared |
04-27-2009, 04:19 PM | #2 |
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Re: 69 chevy tanny ratios?
anybody?
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04-27-2009, 05:00 PM | #3 |
its all about the +6 inches
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Re: 69 chevy tanny ratios?
if it is a c-10, then that rear was swapped in.
If the rear is 67 - 72, then 4.57 is common, and 4.10 being a tick less common. That's about as good as it gets. Can't help you on the tranny ratios. Do you have any photos of the odd parts of the truck? Maybe a pic of the SPID? Whats the first 1/2 of the VIN (full vin is cool too, but some ppl are scared of truck ID theft) photos of the center part of the rear axle would help tons too |
04-27-2009, 05:42 PM | #4 |
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Re: 69 chevy tanny ratios?
like Longhorn said about the rear end, c10= someone swapped in a 3/4 t rear end. If it's a c20 though, you have a 3/4 ton truck. As for the trans, if it's original it could be an sm465. They have a really low granny gear. More info on them here- http://novak-adapt.com/knowledge/sm465.htm
It really depends on what you have, if someone swapped in a different rear, you could easily have a different trans too.
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1970 K20, 350--- SOLD 05 silverado extended cab short box- duramax Jeep wrangler unlimited |
04-27-2009, 06:56 PM | #5 |
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Re: 69 chevy tanny ratios?
Final drive = 1:1 on all transmissions.Then,some have overdrive in later years,but that`s not final drive,that`s beyond final drive.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
04-27-2009, 08:53 PM | #6 | |
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Re: 69 chevy tanny ratios?
I thought "final drive ratio" usually meant the rear end as in
Quote:
Anyway it could be the SM465 referenced above or it could be a NP435 which has 4.56-1 low,2.28 2nd,1.31 3d,and of course 1-1 4th gear.
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. Last edited by WorkinLonghorn; 04-27-2009 at 08:54 PM. |
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04-27-2009, 11:07 PM | #7 |
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Re: 69 chevy tanny ratios?
When talking about a truck,yes.When talking transmissions the final drive is top gear.I didn`t read all of it,I guess.The rear ratio is prolly a 3.73,but you`d have to check to be sure.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 04-27-2009 at 11:10 PM. |
04-28-2009, 09:49 AM | #8 |
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Re: 69 chevy tanny ratios?
thanks for all the info so far. i remember my dad telling me when i was a kid that his father ordered the truck custom tailored to how he wanted it. my dad passed away when i was pretty young so now im just trying to figure out a bit more about the truck, unfortunatly the truck is at my mothers house in NY and im in NH right now. when i get back to visit ill look over the truck and see if i can get some numbers off of the tranny and the rear end, maybe some pics. i thought it was kind of weird to have 6 lugs up front and 8 in the rear. i wouldnt put it past my father or grandfather to swap in a 3/4 ton rear end to handle the work load that they were carrying. my dad used to tow a skidsteer and a tractor with a 4 cyl toyota....
thanks so far everyone -jared Last edited by jwspin; 04-28-2009 at 09:49 AM. |
04-28-2009, 06:17 PM | #9 |
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Re: 69 chevy tanny ratios?
I had a '69 Chevy 4-speed that was an SM465. Now I have a '69 GMC 4-speed with an NP435. The first gears are 6.90:1. The 4.56 first gear came on the later NP435's, not in this vintage truck. Unless of course the tranny was swapped out. The rear end will not be a 3.73. It will most likely be a 4:10, unless something nonstandard was swapped in it. Get the speedo calibrated, get a good accurate tach (if it doesn't have one already), and take it up to 70. If you're in the neighborhood of 3000 RPM, you're running a 4.10 rear end.
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