3 spd auto problem
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New User
Joined: Sep 2006
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From: Texas
3 spd auto problem
I just aquired a 66 f100 swb. It has a 390 with a 3 spd auto trans. (c6 maybe?)The truck hasnt been a daily driver for about 6 years and has only been driven about 50 miles in the last 2 years. Sometimes when I shift into drive it takes a few seconds (maybe 4 or 5) for the trans to "engage". It gets better as it warms up. Anyone ever had this problem? I'm new to classic fords, I'd appreciate any help. Thanks!
Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
gostros, Welcome to FTE 
The nations truck stop.
Does the gear selector have a green dot? That should be your drive position. Have you checked the fluid level? It could have developed some issues from not driving it regulary.
Also you can't look at it and tell the difference, but the engine is highly likely a 352 and not a 390. You can measure the stroke to find out for sure.
John
The nations truck stop.Does the gear selector have a green dot? That should be your drive position. Have you checked the fluid level? It could have developed some issues from not driving it regulary.
Also you can't look at it and tell the difference, but the engine is highly likely a 352 and not a 390. You can measure the stroke to find out for sure.
John
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From: Texas
Thanks for the quick reply. I'll try to post some photos, it may help. The truck has had a lot of work done to it. It has an early 70's steering column and selector. (No green dot.) The truck has had a number of different engines, The previous owner replaced the longblock with the 390. The trans shifts pretty good. I think I will change the fluid and filter, just to be safe.
Postmaster
Joined: Apr 2002
Posts: 3,613
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From: Coal country
I'll second John's welcome with my own - Welcome!
As for your transmission, the best way to ID it is to look at the pan shape, and count the number of bolts.
One quick way to eliminate a number of possibilites without crawling under the truck is this: Look at the bellhousing. Does it bolt to the transmission, or is it one cast piece?
If it is one piece, it is most likely a C-6. If it is separate from the transmission, it is not a C-6. C-6 transmissions are a one-piece case, bellhousing and all.
To alleviate the problem, I would drop the pan and change the fluid and filter. That may - or may not - solve the problem. If the transmission is in bad shape, it may bring it down completely, so be prepared fo rthat possibility.
Good luck, and again, Welcome!
As for your transmission, the best way to ID it is to look at the pan shape, and count the number of bolts.
One quick way to eliminate a number of possibilites without crawling under the truck is this: Look at the bellhousing. Does it bolt to the transmission, or is it one cast piece?
If it is one piece, it is most likely a C-6. If it is separate from the transmission, it is not a C-6. C-6 transmissions are a one-piece case, bellhousing and all.
To alleviate the problem, I would drop the pan and change the fluid and filter. That may - or may not - solve the problem. If the transmission is in bad shape, it may bring it down completely, so be prepared fo rthat possibility.
Good luck, and again, Welcome!
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Originally Posted by gostros
Thanks for the quick reply. I'll try to post some photos, it may help. The truck has had a lot of work done to it. It has an early 70's steering column and selector. (No green dot.) The truck has had a number of different engines, The previous owner replaced the longblock with the 390. The trans shifts pretty good. I think I will change the fluid and filter, just to be safe.
Go to the CP and create a gallery, you can post your photos in there.
thanks
John
Senior User
Joined: Sep 2006
Posts: 197
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From: commerce city co
when a automatic sits for a long period the seals in side will get flat spots and alow fliud to pass buy as the warm up they seal up but not all the way probally time to send it in and get it refreshed
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