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how to tell what engine, tranny truck should have
#570457 Tue Sep 01 2009 11:28 PM
Joined: Aug 2009
Posts: 50
T
trevota Offline OP
Wrench Fetcher
hey I've been looking around and found a couple usefull sites, but i am still unsure how to tell what engine my truck came with from the factory. Hopefully you guys can help or point me in the right direction.

vin# C2545Z1628 on the plate on the driverside kick panel it had:

7500
RPO STD tranny??
525AA paint code? 525 is fawn
127

http://www.americanclassic.com/paint.htm?p1=vin

Thats the site i found, but i cant figure out the engine/ tranny info.


Reason im curious is my truck has a 6cyl in it now. According to the previous owner, and other obivous modifactions they did to put a straight6 in, im sure it had a v8 to start with.

some info: 65' , its a 3/4ton has what looks like a factory 4 on the floor with the high hump floor.

Last edited by trevota; Tue Sep 01 2009 11:48 PM.
Re: how to tell what engine, tranny truck should have
trevota #570486 Wed Sep 02 2009 12:53 AM
Joined: Sep 2006
Posts: 841
H
Shop Shark
since it has the high hump pan i bet it was originally a sm420 4 speed. what kind mods make it known it has been changed to 6 cyl?

Re: how to tell what engine, tranny truck should have
hoggyrubber #570590 Wed Sep 02 2009 12:29 PM
Joined: Jul 2008
Posts: 1,275
H
Shop Shark
I gotta ask 'cause I keep hearing about the high hump tranny tunnel.

Was this only on C20's and bigger or was this something the factory also did on C10's?

Can you explain more about the "high hump" floor pan? Got any dimensions as far as what is standard tranny tunnel height vs. "high hump"?

Thanks,

John


In the Stovebolt Gallery ~~ "The Orange Crate" 1965 C10 SWB Step Side Build Thread

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Re: how to tell what engine, tranny truck should have
Hot Rod John #570595 Wed Sep 02 2009 01:14 PM
Joined: Apr 2006
Posts: 78
D
Shop Shark
I do know that my 66 c10 has a high hump with a transfer case shifter hole because the PO put a sm420 in and it fits right in. so I'm guessing 4x4s had it. I'll measure it when I get home.


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Re: how to tell what engine, tranny truck should have
David13 #570622 Wed Sep 02 2009 03:10 PM
Joined: Mar 2009
Posts: 789
P
'Bolter
the 4spd version used the high hump floor all models
ron

Re: how to tell what engine, tranny truck should have
padresag #570751 Thu Sep 03 2009 01:32 AM
Joined: Aug 2009
Posts: 50
T
trevota Offline OP
Wrench Fetcher
high hump floors were for the 4spd. the sm420 has a high shift tower on the tranny... thus needing a high hump floor for it to fit.


how i know its not stock, motor mounts have been played with, they are bolted to the frame, not riveted like factory. Truck has a 1976-79 250I6 car engine in it. it has the intake manifold thats integeral to the head. The throttle linkage was mickey moused together. And the previous owner said it is supposed to have a v8 in it, but he did not know if it was a 283 or 327

Last edited by trevota; Thu Sep 03 2009 01:32 AM.
Re: how to tell what engine, tranny truck should have
trevota #570771 Thu Sep 03 2009 02:08 AM
Joined: Sep 2006
Posts: 841
H
Shop Shark
hot rod john, i used to have a 66 c20 with a low hump so not all of them had the high hump. the c20 usually had the 4 speeds though so that's prob why most had them. in fact some of the bigger trucks have neither, they have "no hump" like the 62 and 65 c60's i used to have. no need for measurements, the low hump are round high are more square. trevota, sounds like you are right on since the manifold situation. the motor perches would not have been moved from the v8 to the 250 and the ones i have seen are bolted in not riveted. only the bracket that bolts to block is different. sorry i can't answer what engine was orig in there, i don't know much about the #'s. maybe someone will be able to.

Re: how to tell what engine, tranny truck should have
hoggyrubber #570797 Thu Sep 03 2009 03:15 AM
Joined: Dec 2008
Posts: 340
M
Shop Shark
I'm guessing maybe the GMC's all came with the high hump. Mine is a regular 2 wd short 1/2 ton that originally came with the 3 on the tree and it came with high hump. The difference is obvious once you know what to look for. The low hump has a somewhat bellhousing shape transition between the firewall and floor. The cover/pan in front of the seat appears to be about 1-2" tall. The high hump is about 6-7" tall running forward from the seat, and is very square in appearance.

Re: how to tell what engine, tranny truck should have
Markeb #570910 Thu Sep 03 2009 02:03 PM
Joined: Dec 2008
Posts: 319
S
Shop Shark
I don't think the 327 was available 'til '66...at least in 10's.
I've had a '74 250, a '66 327, and back to a 6 in my '65 C10 and never had to touch the motor mounts, which are bolted to the frame.


If you can't fix it with a hammer and screwdriver, you need a bigger hammer.
1965 Chevy C10
Re: how to tell what engine, tranny truck should have
trevota #570929 Thu Sep 03 2009 03:18 PM
Joined: Mar 2009
Posts: 789
P
'Bolter
Originally Posted by trevota
high hump floors were for the 4spd. the sm420 has a high shift tower on the tranny... thus needing a high hump floor for it to fit.


how i know its not stock, motor mounts have been played with, they are bolted to the frame, not riveted like factory. Truck has a 1976-79 250I6 car engine in it. it has the intake manifold thats integeral to the head. The throttle linkage was mickey moused together. And the previous owner said it is supposed to have a v8 in it, but he did not know if it was a 283 or 327


2 wheel drive perches were bolted in while 4 x 4 were rivited in
230 and 250 eng perches were located in the frt 2 frame holes while 283 perches were located in the rear 2 holes. the 292 were offset with the pass side being forward of the other side
ron

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