T5 behind a 351C...?
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Tuned
Joined: Mar 2017
Posts: 256
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T5 behind a 351C...?
I tried to search this out, but not getting any results with a 2-character "T5" or T-5" query.
I have a 1970 351C with a 4-speed in my '63 F100.
I'd like to reduce my highway RPMs with an overdrive.
Any recommendations or resources on what I need for clutch, bell housing, etc...?
I have a 1970 351C with a 4-speed in my '63 F100.
I'd like to reduce my highway RPMs with an overdrive.
Any recommendations or resources on what I need for clutch, bell housing, etc...?
Logistics Pro
Joined: May 2015
Posts: 4,474
Likes: 974
From: Tri Cities, TN
Your best bet would be to call Summit or Jeg's tech line and see what they can come up with. Because you are going to have to mix and match to make that work. Basically you need a small block bellhousing for a T5 that has room for a 164T, 28oz. unbalance flywheel. What kind of rpm are you turning at 65mph? My Cleveland is perfectly happy going down the road at 3000 rpm. If you just want an overdrive an AOD swap would probably be cheaper.
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Tuned
Joined: Mar 2017
Posts: 256
Likes: 15
Kinda wanted to keep manual trans, but I'll look into your AOD recommendation or possibly a diff gear swap to a smaller ratio.
Logistics Pro
Joined: May 2015
Posts: 4,474
Likes: 974
From: Tri Cities, TN
You can calculate the engine rpm using your rear tire diameter and axle ratio. Here is a link to a chart that won't be perfectly dead on, but close enough.
https://www.jeepfan.com/tech/tire-to-rpm-ratio-chart/
https://www.jeepfan.com/tech/tire-to-rpm-ratio-chart/
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
You just need a T5 adapter plate to run one with your current 4 speed bell. T5 has a longer input shaft, so this is an easy straightforward swap with an adapter plate. The classic Mustang vendors sell the plates
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Tuned
Joined: Mar 2017
Posts: 256
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Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
Ford T5's have the same spline and diameter as the small block Toploaders ( 1-1/16" x10 spline)
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