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T5 spacer plate fabrication/rear end?
#856387 Mon Jun 04 2012 03:21 AM
Joined: Feb 2012
Posts: 43
Wrench Fetcher
So, I've been looking at the different ways to mount the T5 to the back of a 235 and I think I might try and make an spacer plate. I have access to a milling machine and am pretty handy with it, but I'm not sure about doing the large center hole in the plate. I don't think I have a cutter that large and that would be my only problem. Does it need to be round like that to fit into something or is that just to make them look nice. I can make the plate and just mill out the middle. Is there any reason why I couldn't do this?

Also, can someone direct me to a link, or if they know of which 6 lug rear axle setup would work best for converting over to open drive line. I don't want to mess with the original rear, and I don't want 5 lug ether. My T5 is a 145, or the .72 OD tranny. Just picked it up yesterday for $40.

My truck is a 49 3100 5 window currently with a 235 and had a 4 speed. Not running of course! The truck was started as a project and I'm assuming someone dropped in the 235 (1954 vintage) and never got past the transmission.

Any info would be helpful.

Last edited by spitfire18; Mon Jun 04 2012 06:00 AM.
Re: T5 adapter plate fabrication/rear end?
spitfire18 #856404 Mon Jun 04 2012 03:49 AM
Joined: Jan 2001
Posts: 4,946
Shop Shark
You will not need an adapter to bolt a T5 to your 49, they have the same bolt pattern. You will only need to drill the metric mounting holes in the trans to the required 1/2" size.

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Re: T5 adapter plate fabrication/rear end?
Pre '68 Dave #856421 Mon Jun 04 2012 04:25 AM
Joined: Apr 2008
Posts: 237
Shop Shark
I put a T5 in my '55 1st series. Removed approx 3/8 from the forward splined shaft of the T5. Adapter plate is not required. My truck had an open drive line which I modified and used. I used the original 1955 rear end.


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Re: T5 adapter plate fabrication/rear end?
nels1954 #856430 Mon Jun 04 2012 05:08 AM
Joined: Feb 2012
Posts: 43
Wrench Fetcher
I'm trying to avoid having to cut down the input shaft, not that I can't do it, but I would like to have it done to be a little more reliable maybe and a little easier to not have to modify stuff again if I'm in a pinch somewheres.

I also have a second question. I was looking here:
I noticed that they swaped from torque tube to open drive line. I have access to a 56 1/2 ton rear end and Can I do this swap with my rear end (stock as of now)?

Re: T5 adapter plate fabrication/rear end?
spitfire18 #856431 Mon Jun 04 2012 05:21 AM
Joined: Feb 2012
Posts: 43
Wrench Fetcher
I guess I should have clarified, that I'm wanting to make a spacer plate, not an adapter plate..... it's getting late!

And as far as the rear end swap, I'm wondering if it can be done, is it a big job as far as re-setting the gears, and ripping the rear end apart, or is it fairly easy. I've never taken a rear end apart, but I'm fairly mechanical so I think I could figure it out. 0

Re: T5 adapter plate fabrication/rear end?
spitfire18 #856514 Mon Jun 04 2012 05:14 PM
Joined: Jan 2000
Posts: 2,041
Shop Shark
Spitfire, You will not NEED an adaptor plate but a spacer will solve some issues as the input shaft on a T-5 is longer than original trans and will need attention and an adaptor takes care of that. Also I'd suggest reading ALL tech articles on this swap here and over on site.

My spacer plate is simple but has some imortant details. Like a lip on the front side that keeps it dead center in relation to the bellhousing, where just a 'spacer' does not.

Also you may want to contact Buffalo Ent. ph. 360 652-7684, makes adaptor plates and surely has ALL the answers on this and rear end swaps et.
Best of luck

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Re: T5 adapter plate fabrication/rear end?
JiMerit Boltr#43 #856542 Mon Jun 04 2012 06:43 PM
Joined: Feb 2003
Posts: 452
Shop Shark
I think you'll find that the fit of the transmission bearing retainer into the hole in the back of the bell housing is important for alignment of the transmission. A proper adapter or spacer will have a matching hole and lip to maintain this alignment. The mounting bolts will allow too much movement and will eventually damage the input shaft or bearing of the transmission.
Somewhere here is a post about using a Jeep T-5 input shaft. It matches the splines of the original clutch disc and is shorter by the right amount to make the trans a bolt-in. Worth looking into?

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Re: T5 adapter plate fabrication/rear end?
Highflyer #856685 Tue Jun 05 2012 04:44 AM
Joined: Feb 2012
Posts: 43
Wrench Fetcher
screw it, sounds like the easiest thing to do is to shorten the shaft in both places.

I've read just about every tech article I can find online.

Anybody have any ideas on putting 56 truck diff guts in to the 49 axle housing?

Re: T5 adapter plate fabrication/rear end?
spitfire18 #856842 Tue Jun 05 2012 09:25 PM
Joined: Jun 2004
Posts: 8,192
Master Gabster
Get a 55-62 center section & put it in your houseing.

They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup

Re: T5 adapter plate fabrication/rear end?
Wrenchbender Ret. #856876 Wed Jun 06 2012 12:21 AM
Joined: Feb 2012
Posts: 43
Wrench Fetcher
Do you think it would be easier to change out the guts, or just put the complete 56 rear end into the 49 truck? I have access to a welder, but i'm trying to do as much as possible right now without too much fab work.

If I swap out center sections, will I have to pull the axles and re-set the gear clearance?

Last edited by spitfire18; Wed Jun 06 2012 12:28 AM.
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