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Anarchy99
Jim Purdy
Memphis, TN
(108 posts)

Registered:
12/06/2013 03:54PM

Main British Car:
61 austin healey sprite LS6

Transmission direct to rear end questions...
Posted by: Anarchy99
Date: February 05, 2016 02:37PM

So I'm trying to measure for an engine trans swap and cutting, welding, etc isn't the issue, it's, well... The tail shaft of the trans I was thinking of using basically would be real real close to the rear end. No room for a drive shaft. I think the cheetah car was directly bolted to the rear from the trans, so I'm pretty sure it's been done before, and if this isn't the right forum, please move me around... But what would needed to be done, solid motor mounts and an independent rear setup? Should that make it all work and allow room for flex under acceleration, etc? A single joint linking both yokes? Thanks in advance.
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DiDueColpi
Fred Key
West coast - Canada
(1259 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
What if the Hokey Pokey really is what it's all about?

authors avatar
Re: Transmission direct to rear end questions...
Posted by: DiDueColpi
Date: February 05, 2016 05:17PM

What you need Jim is a transaxle from a C5 or newer Corvette.
IMGP9678.JPG
IMGP9680.JPG
They normally are connected by a torque tube to the engine. These can be shortened or lengthened as needed.
I've lengthened mine to use in my 62 Impala.
If it needs to be really short you can bolt on the bellhousing from a later 4L60E and bolt the engine directly to the transaxle.
IMGP9679.JPG
You will need some form of independent suspension and the Corvette is a good donor for that as well.
Like we are doing to a little Suzuki Carry with a 6-71 blown 377 SBC.
IMGP9681.JPG
I've bought two of these setups now. One is standard and one is the auto.
They have been relatively easy to find and prices aren't that bad at all.

Live like you mean it.
Fred


Anarchy99
Jim Purdy
Memphis, TN
(108 posts)

Registered:
12/06/2013 03:54PM

Main British Car:
61 austin healey sprite LS6

Re: Transmission direct to rear end questions...
Posted by: Anarchy99
Date: February 05, 2016 05:27PM

Yeah... I just sold the supercharged c5 I built up... I'm familiar with the torque tube, etc... It will not work in this application. I don't really want to toss my cards on the table just yet for the exact car, etc... but I'm thinking I have to mate a tail shaft to a c4 independent suspension with no driveshaft.

This is going in a small British car,etc... Trust me... Running the tape measure, it's too close from trans to rear I'll be scratching my head to fit joints in between. Please keep the inputs coming.


DiDueColpi
Fred Key
West coast - Canada
(1259 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
What if the Hokey Pokey really is what it's all about?

authors avatar
Re: Transmission direct to rear end questions...
Posted by: DiDueColpi
Date: February 05, 2016 05:55PM

What dimensions are you needing?
From axle C/L to block face.
You could use a single Ujoint and a slipyoke. Or better a double cardan joint. But your alignment between the trans and carrier would need to be spot on and rock solid.
A 4X4 trans and a transfer case coupling with a little fabrication might work out as well.


Anarchy99
Jim Purdy
Memphis, TN
(108 posts)

Registered:
12/06/2013 03:54PM

Main British Car:
61 austin healey sprite LS6

Re: Transmission direct to rear end questions...
Posted by: Anarchy99
Date: February 05, 2016 06:13PM

More to follow tomorrow... You guys will figure it out when I post the details, but long story short, what do you need to do to mate a trans to a rear diff, without using a driveshaft


Orange Alpine
Bill Blue

(45 posts)

Registered:
12/20/2010 07:36AM

Main British Car:
1967 Sunbeam Alpine 2.5 Ford Duratec

Re: Transmission direct to rear end questions...
Posted by: Orange Alpine
Date: February 06, 2016 06:49AM

A coupler that will allow misalignment. Something like the industrial setup that uses a sprocket on each shaft, joined by a double width chain. Not pretty, but effective and strong.

[www.mcmaster.com]

Even if you luck out and get them perfectly aligned, flex will be an issue.

Bill


Anarchy99
Jim Purdy
Memphis, TN
(108 posts)

Registered:
12/06/2013 03:54PM

Main British Car:
61 austin healey sprite LS6

Re: Transmission direct to rear end questions...
Posted by: Anarchy99
Date: February 06, 2016 11:03AM

Would 6 inches of driveshaft length be long enough to run a live axle rear end without issues?



joe_padavano
Joseph Padavano
Northern Virginia
(121 posts)

Registered:
02/15/2010 03:49PM

Main British Car:
1962 F-85 Deluxe wagon 215 Olds

Re: Transmission direct to rear end questions...
Posted by: joe_padavano
Date: February 06, 2016 04:48PM

"Would 6 inches of driveshaft length be long enough to run a live axle rear end without issues?"

Sure. So long as the rear axle was welded to the frame and unable to move...

You need to lay out the suspension motion (up and down as well as side to side and rotationally while cornering) and then figure out what the driveshaft and u-joints need to do. The answer will show that a live axle will need a LOT more driveshaft for reasonable amounts of suspension travel to avoid binding the U-joints.

Your only other option is an independent suspension so the diff can be hard mounted and the half shafts provide the suspension travel. That's why the Corvette transaxle was suggested.


Anarchy99
Jim Purdy
Memphis, TN
(108 posts)

Registered:
12/06/2013 03:54PM

Main British Car:
61 austin healey sprite LS6

Re: Transmission direct to rear end questions...
Posted by: Anarchy99
Date: February 06, 2016 05:04PM

I haven't ruled out a c4 suspension... Going to a manual will be tight in the footbox but will be a lot shorter than the auto I was looking at... It would give enough length, i think(without having it all sitting in front of me), to have a short driveshaft, but I think long enough to keep from binding


DiDueColpi
Fred Key
West coast - Canada
(1259 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
What if the Hokey Pokey really is what it's all about?

authors avatar
Re: Transmission direct to rear end questions...
Posted by: DiDueColpi
Date: February 24, 2016 11:52AM

So what's happening Jim?
You're keeping an idiot in suspense.


roverman
Art Gertz
Winchester, CA.
(2974 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Transmission direct to rear end questions...
Posted by: roverman
Date: February 24, 2016 06:06PM

Jim and clan, Transaxles vary a lot, from mounting face to CV centerlines. As example , Corvette C5, mounting face to CV centerline is 24". On Porsche Boxster "S", it's only 8". I needed the 8" CL for cabin room. Food for Thought. roverman.


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