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#1 |
Registered User
Join Date: Dec 2013
Location: clovis NM
Posts: 13
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69 C10 with a 6l90 transmission HELP
Hoping to get some help. I have read that when putting a 6l90 that I would need to cut the floor and use the high hump. So I did that and put the cab in the frame and as you can see by the pic the end shaft and the 3 bolt flange are inside the cab. I have Holley motor mounts and tinworks frame stiffener with trans mount. I don’t know the angle of the engine and transmission. I know it should be 3 deg I just don’t know if that will give me the clearance I need. Let me know what I need to do. TIA
Last edited by reddogg; 07-29-2024 at 08:26 AM. Reason: Added pic |
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#2 |
Registered User
Join Date: Apr 2008
Location: Md
Posts: 2,475
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Re: 69 C10 with a 6l90 transmission HELP
Not the same as your application, but mine took 3 different motor mount combinations before getting engine placement correct.
.. More information needed for others to help solve your dilemma. Photos also get you better responses.....good luck.
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#3 |
Registered User
Join Date: Dec 2013
Location: clovis NM
Posts: 13
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Re: 69 C10 with a 6l90 transmission HELP
Pic
Last edited by reddogg; 07-29-2024 at 08:44 AM. |
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#4 |
Registered User
Join Date: Oct 2013
Location: Alabama
Posts: 1,222
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Re: 69 C10 with a 6l90 transmission HELP
considered ditching the huge bolt flange and using a slip yoke?
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#5 |
Registered User
Join Date: Sep 2020
Location: Cleveland, Ohio
Posts: 534
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Re: 69 C10 with a 6l90 transmission HELP
I am a bit confused on your set-up. Do you have a picture of the crossmember mounted in the vehicle without the transmission? I do not see the crossmember by itself.
I have a 6l80 and granted it is a bit smaller, I doubt that would affect the mounting location. I have no problem at all with a high hump and a standard yoke. |
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#6 |
Senior Member
![]() Join Date: Mar 2015
Location: washington
Posts: 2,256
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Re: 69 C10 with a 6l90 transmission HELP
The output yolk style is different between the car and truck on this transmission. The 2-wheel drive truck transmission is harder to find. Getting a drive shaft to work for this transmission is a separate discussion. I did find a picture of the parts required to change a truck transmission to a Camaro, just to give you ideas.
I recommend getting the driveshaft type straightened out before committing to engine/transmission height as it is likely the transmission cross-member will require modification to get everything to work together. Sometimes it requires a different tail shaft. Depending on which drive line style you choose. If you measure the distance from the top of the cross-member to the center-line of the transmission output shaft it would establish a starting point. Is it possible the cross-member was designed for a more common conversion? Last edited by Accelo; 08-01-2024 at 09:39 AM. |
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#7 |
Moderator
![]() Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,193
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Re: 69 C10 with a 6l90 transmission HELP
A word of caution....the large tri flange drive system is designed to fit into a vehicle with a rear end that does not move relative to the vehicle chassis.
If the vehicle you are installing this into has a live rear axle, you MUST have some form of slip joint in the drive shaft to permit the driveshaft to move in and out of the transmission with the movement of the suspension. Unless you are running something like a corvette independent rear end, you should have a slip joint in the driveshaft.
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#8 |
Registered User
Join Date: Dec 2013
Location: clovis NM
Posts: 13
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Re: 69 C10 with a 6l90 transmission HELP
I have the driveshaft taken care of through PST. It will have a slip yoke. I am just wondering about the clearance under the cab and the rear cab support it doesn’t seem like it will clear without cutting it
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#9 |
Registered User
Join Date: Sep 2020
Location: Cleveland, Ohio
Posts: 534
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Re: 69 C10 with a 6l90 transmission HELP
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#10 |
Registered User
Join Date: Dec 2013
Location: clovis NM
Posts: 13
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Re: 69 C10 with a 6l90 transmission HELP
From the bottom
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