Motor swap
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Tuned
Joined: Aug 2019
Posts: 253
Likes: 4
Motor swap
What would it take to put a 300 straight six in the place of a 352 and would it bolt directly to my 4spd and what years of motors will work and what do I need to put it in my truck is a 66 ford f100 with a 352 and a 4spd
Cargo Master
Joined: Sep 2005
Posts: 2,958
Likes: 886
From: Montana
I'm thinking the motor mounts are not the same... As I recall, the 300 has the same bell housing pattern as a small block. I installed a 300 in the place of a 302 in a dentside years ago. Finding the correct motor mounts was the hardest part as I recall. Good luck. I'd considered this same swap in place of my y-block, but my block checked out so I'm keeping it original. If you do go forward, I'd look for a mid 90s fuel injected unit. Swap over all the wiring and you could also use the trans (if the donor still had it).
Tuned
Joined: Jul 2018
Posts: 279
Likes: 11
I'm not too familiar with mounts but the parts suppliers suggest that the 65-74 240/300 mounts are the same. The bell housing and it's contents would need to be changed. The bell is the same as the 302. There is more than one "4spd" found in these trucks which one do you have?
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Tuned
Joined: Aug 2019
Posts: 253
Likes: 4
I'm not too familiar with mounts but the parts suppliers suggest that the 65-74 240/300 mounts are the same. The bell housing and it's contents would need to be changed. The bell is the same as the 302. There is more than one "4spd" found in these trucks which one do you have?
Cargo Master
Joined: Jan 2016
Posts: 2,671
Likes: 372
Just a couple comments...
- I think the 302's are internally balanced (I'm not sure) but I'm positive the 300 I-6's are externally balanced so you'll need a flywheel for a 300.
- Also, since you'll definitely need a bellhousing anyway, now is the time to consider getting a 5 speed with integral bellhousing. You may need to monkey with the driveshaft but if you do any amount of highway driving you may like having a 5 speed...kinda depends on how you want to use the truck.
- I think the 302's are internally balanced (I'm not sure) but I'm positive the 300 I-6's are externally balanced so you'll need a flywheel for a 300.
- Also, since you'll definitely need a bellhousing anyway, now is the time to consider getting a 5 speed with integral bellhousing. You may need to monkey with the driveshaft but if you do any amount of highway driving you may like having a 5 speed...kinda depends on how you want to use the truck.
Thread Starter
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Tuned
Joined: Aug 2019
Posts: 253
Likes: 4
Just a couple comments...
- I think the 302's are internally balanced (I'm not sure) but I'm positive the 300 I-6's are externally balanced so you'll need a flywheel for a 300.
- Also, since you'll definitely need a bellhousing anyway, now is the time to consider getting a 5 speed with integral bellhousing. You may need to monkey with the driveshaft but if you do any amount of highway driving you may like having a 5 speed...kinda depends on how you want to use the truck.
- I think the 302's are internally balanced (I'm not sure) but I'm positive the 300 I-6's are externally balanced so you'll need a flywheel for a 300.
- Also, since you'll definitely need a bellhousing anyway, now is the time to consider getting a 5 speed with integral bellhousing. You may need to monkey with the driveshaft but if you do any amount of highway driving you may like having a 5 speed...kinda depends on how you want to use the truck.
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Fleet Mechanic
Joined: Jun 2019
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From: Southern California
If the 300 has the same bell housing as the small blocks, 302 in particular, a T-5 out of a fox body mustang would work. Maybe swap the back half of it with an S-10 T5 to get the shifter more forward.
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Cargo Master
Joined: Jan 2016
Posts: 2,671
Likes: 372
The t5 already mentioned would probably work.
Could also go with an automatic overdrive.
Nice thing about the 300 is that it has the same bell pattern as the 302 which opens up some choices for tranny.
Tuned
Joined: Jul 2018
Posts: 279
Likes: 11
No, you don't need a bellhousing from a 302, the bellhousing just happens to be for both. You do however NEED a clutch kit for a 300. Commonly available over the counter.
Cargo Master
Joined: Sep 2005
Posts: 2,958
Likes: 886
From: Montana
Just a couple comments...
- I think the 302's are internally balanced (I'm not sure) but I'm positive the 300 I-6's are externally balanced so you'll need a flywheel for a 300.
- Also, since you'll definitely need a bellhousing anyway, now is the time to consider getting a 5 speed with integral bellhousing. You may need to monkey with the driveshaft but if you do any amount of highway driving you may like having a 5 speed...kinda depends on how you want to use the truck.
- I think the 302's are internally balanced (I'm not sure) but I'm positive the 300 I-6's are externally balanced so you'll need a flywheel for a 300.
- Also, since you'll definitely need a bellhousing anyway, now is the time to consider getting a 5 speed with integral bellhousing. You may need to monkey with the driveshaft but if you do any amount of highway driving you may like having a 5 speed...kinda depends on how you want to use the truck.
Mountain Pass
Joined: Apr 2020
Posts: 106
Likes: 11
Please correct me if I'm wrong 300, 302 & 351w all the same bell housing to engine mounting pattern. In previous threads I haven't seen it mentioned where a ZF5-42 is a good option for the 300 in these old trucks how does the ZF5-42 and the M5OD-R2 compare? Would this be a good option for Branden as well?
Cargo Master
Joined: Sep 2005
Posts: 2,954
Likes: 64
FYI, 302s are externally balanced... Early motors used a 28 oz. weight and newer motors used a 50 oz. When upgrading to a 5 speed, you must use the correct flywheel and balancer for the trans. A t-5, being originally used on the later 302s, should require a 50 oz. flywheel. Then there are 2 different tooth counts as I recall. 157 and 164, IIRC. I believe the same goes for the 300. It's been a while since I've done the t-5 swap into my Mustang, but it was pretty straight forward. I see several guys around here have done the swap, which surprises me... The t-5 is a decent car trans, but not great for a truck. Kind of light duty and the gearing is not really meant for a heavy truck. I could see blowing one up if One were to tow often with it. My 2cents.
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