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T5 swap for 258

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jorgoth View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jorgoth Quote  Post ReplyReply Direct Link To This Post Topic: T5 swap for 258
    Posted: Oct/27/2014 at 11:16am
As the title suggests, I'm hoping to swap the Borg Warner T5 trans out of a squarebody s-10. I've heard that the spline shaft dimensions are all the same, and that I don't have to change my clutch or bell housing.
If anyone could point me to another thread that Im not seeing, or confirm/deny this, that'd be great.
Thanks, joey
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scott View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote scott Quote  Post ReplyReply Direct Link To This Post Posted: Oct/27/2014 at 2:39pm
The S-10 T-5 won't fit. Well, not easily or inexpensively. What you are looking for is a Ford T-5, preferably out of a 5.0 car. You may have to swap the bell, depending on what year 258 you are working with. Check for threads swapping a T-5 behind a V8, most info should apply to a 72 & newer 258. 
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jorgoth View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jorgoth Quote  Post ReplyReply Direct Link To This Post Posted: Oct/27/2014 at 3:29pm
What is the difference between my 3-spd, and the s-10 trans?
What bellhousing will I need if I have to use the trans from the 5.0?
Is it a 5.0 mustang or truck? And what year?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote scott Quote  Post ReplyReply Direct Link To This Post Posted: Oct/27/2014 at 3:39pm
It will help to know what year & model of engine & transmission you currently have. As well as what car you are hoping to install the T-5.

You will need a bellhousing 6 1/2" deep, with the Ford T-5 bolt pattern on it. Many bellhousings are drilled for a variety of bolt patterns, some just for one or two. You may have to tap the holes you need in the bellhousing, sometimes they are drilled, but not tapped. These bells were used in late 70's early 80's AMC stick cars, as well as Jeeps from the same era.

You're looking for a T-5 out of a 5.0 Mustang, roughly 83-92. The newer transmissions have many upgrades over the early ones, Borg Warner was upgrading the T-5 every year. There are 4 & 6 cylinder T-5's out there, they are weaker, & have much less desirable gear ratios compared to the 5.0 T-5. I personally wouldn't use anything but the 5.0 T-5.

Your swap will most likely be very similar to the one detailed here: http://www.schwallers.com/Scott/AMC/64American/T5Swap.htm


Edited by scott - Oct/27/2014 at 3:44pm
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Fluffy73 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fluffy73 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/27/2014 at 5:12pm
The S-10 Trans is a poor choice to use in the AMC. First, I believe that's the one that's clocked over a few degrees.

Since you plan to use a 258, you could probably get away with using even a 4 or 6 cylinder Mustang T5.
They have the same ratios as the AMC T5 did that was used behind the 258 in the Eagles. The input torque rating is nearly the same as well.

Like Scott said, look for a Mustang, 83 through 92.  You don't necessarily need the 5.0 one, but would be good if you could grab one.

For bellhousing, you can also find the one you need in AMC Eagles '80 thru '88 with the 4 or 5 speed.

I am genetically incapable of being Politically Correct.
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jorgoth View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jorgoth Quote  Post ReplyReply Direct Link To This Post Posted: Oct/27/2014 at 6:39pm
Originally posted by Fluffy73 Fluffy73 wrote:

The S-10 Trans is a poor choice to use in the AMC. First, I believe that's the one that's clocked over a few degrees.

Since you plan to use a 258, you could probably get away with using even a 4 or 6 cylinder Mustang T5.
They have the same ratios as the AMC T5 did that was used behind the 258 in the Eagles. The input torque rating is nearly the same as well.

Like Scott said, look for a Mustang, 83 through 92.  You don't necessarily need the 5.0 one, but would be good if you could grab one.

For bellhousing, you can also find the one you need in AMC Eagles '80 thru '88 with the 4 or 5 speed.





Okay. First question "where the heck am I gonna find an eagle"
'74 gremlin with a 258. Original 3-spd.
I plan on building the engine per Clifford performance.
I'll be pushing 230hp, 420lb/ft so strength is a definite must. I don't want to break any trannies
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FuzzFace2 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/27/2014 at 9:02pm
As said do a search for T5 swaps as all the information on parts needed is listed in the posts. I would go with a ford WC T5 that is used with the 5.0 cars.

The ford T5 is a bolt in using AMC parts where the GM T5 you would need to buy a Lake Wood bell housing $$$ and maybe some other non-standard parts to make it work in an AMC.

BTW AMC made a deep (v8) bell and a short (I6) bell and the one you need is the short one for the ford T5 swap. You may need to drill & tap the bell for the T5 trany.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fluffy73 Quote  Post ReplyReply Direct Link To This Post Posted: Oct/27/2014 at 9:17pm
Originally posted by jorgoth jorgoth wrote:


Okay. First question "where the heck am I gonna find an eagle"
'74 gremlin with a 258. Original 3-spd.
I plan on building the engine per Clifford performance.
I'll be pushing 230hp, 420lb/ft so strength is a definite must. I don't want to break any trannies


Well, if you're aiming for 420lb/ft of torque, you don't want a T5. They're only good for about 300lb/ft of input torque. Even the World Class - even the Cobra ones won't live up to that for very long.  Back in the day, it was pretty easy to blow one up in a stock 5.0 Mustang.

To answer your question: Eagles are probably the easiest AMC to find. They are the newest and they made quite a few of them. Check your local junkyards. Eagles are invaluable sources for parts since they are basically Hornet Sportabouts.  Door handles, door hinges, radiators, hood hinges, side markers .... all sorts of stuff can be repurposed into a Hornet or Gremlin.
I am genetically incapable of being Politically Correct.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Oct/28/2014 at 7:28am
Use the link that Scott provided. Steps for the I-6 conversion is exactly the same as for the AMC V-8. Schwaller's doesn't say wher the bell comes from. The SR4 was used 77-79 (the only AMC four speed of the time, only one used in Spirit/Concord with six or 304... four cylinder bells won't work). From 1980 on almost all AMC and Jeep 258 six cylinder bells are a multi-pattern bell that will accept the T-5. The4.0L used a different trans. I'm not sure about 87-89 258s, but the 80-86 models should mount a T-5 with no problems. The 77-79 bells may be multi-pattern also. You might have to pull the trans to see. If there are more than the four bolt holes that the trans you pull used then it is the multi-pattern bell. I have one that came from a 79 Spirit.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote White70JavelinSST Quote  Post ReplyReply Direct Link To This Post Posted: Oct/28/2014 at 12:41pm
Don't forget to find a clutch disc from a T5 Mustang or AMC T5. The transmission behind your 258 has a 1-1/8 inch diameter 10 spline input shaft. The Ford and AMC T5 are 1-1/16 diameter 10 spline. Also you will need to change the bushing in the back of the crankshaft to one that matches the input shaft tip diameter, a part number for the bushing has been posted on this forum many times.

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