351w in 69 stepside
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New User
Joined: Feb 2003
Posts: 5
Likes: 0
From: florida
351w in 69 stepside
im rebuilding my 351w to put in my 69 stepside i already have a welded 9" rear with 4:11 gears. i have a standard 4 speed with granny for first. im wandering the best tranny for my setup. ive heard the c6 is best but i blew 2 of them when my 351w was in my 74 swb ford. i need a 4th gear because of my 4:11 gear but i cant find an auto. should i change my rear gear or keep looking for a tranny. so far my engine is .030 over and i have a mild cam, roller rockers, headers, intake, carb. i want to stroke it but not sure if i should make it longer or shorter. any info would help, hopefully one day my 69 will run 10's in the qtr.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
351w in 69 stepside
Buzz, What will you be using the truck for mostly? Looks to me like you are building a drag racer with 4.11 gears behind a 351W. In that case grab a top loader from a car.
You said that you needed a 4th gear, well all trannys (non under/overdrive) have a final 1 to 1 output ratio. So a 9 speed tranny will be the same as a 3 spd.
Sounds like your truck had a I-6 in it from the factory and was designed for pulling and a top speed of about 55-60 mph. Not an over the road vehicle.
C6s certainly can be built for drag racing and remain bullet proof.
Good luck on the truck.
You said that you needed a 4th gear, well all trannys (non under/overdrive) have a final 1 to 1 output ratio. So a 9 speed tranny will be the same as a 3 spd.
Sounds like your truck had a I-6 in it from the factory and was designed for pulling and a top speed of about 55-60 mph. Not an over the road vehicle.
C6s certainly can be built for drag racing and remain bullet proof.
Good luck on the truck.
Senior User
Joined: Aug 2002
Posts: 327
Likes: 1
From: Saskatchewan
351w in 69 stepside
If that were me (hopefully soon it will be) I would leave the 4spd. Unless you are not comfortably driving standard. The four speed will be a lot more fun to drive in my opinion.
1970 Ford F100 Custom
302 3spd
1970 Ford F100 Custom
302 3spd
