Mitchell overdrive
- Thread starter flathead47
- Start date
Rem
Member
40Pickup, that's a very nice job. What are the drawings modelled in, if you don't mind me asking?
Hi Mart, do you have the Volvo O/D? I have a couple of Triumph and Ford J-Types awaiting some investigation (I started looking while I had the '34, but perhaps I'll get onto it this year with the B). The Ford (Scimitar) one wouldn't be too useful as it has a splined output shaft, but the Triumph one has a flange like the Volvo appears to.
Hi Mart, do you have the Volvo O/D? I have a couple of Triumph and Ford J-Types awaiting some investigation (I started looking while I had the '34, but perhaps I'll get onto it this year with the B). The Ford (Scimitar) one wouldn't be too useful as it has a splined output shaft, but the Triumph one has a flange like the Volvo appears to.
Mart
Well-known member
Hi Andy - my od unit came from some sort of a vauxhall or something - it has a splined output but I have the prop yoke - hopefully it's forged so I can weld to it. I have a plan in my mind, but have not cut up any early ford parts yet.
I'm pretty sure you can mix and match parts if the basic unit is the same - if the front end of the scimitar unit is more easily adaptable, you could use it with the flanged output from the Triumph unit if that is the easiest to adapt.
I'm hoping to connect to the output casing without welding a flange on so that will be interesting. Maybe I should be looking for a different output but plan on welding on a flange - something to consider I suppose.
Mart.
Rem
Member
Hi Mart, I'm hoping that there is some swapability in the parts. Gavin was also looking at using a J-Type, so maybe we should compare notes next year?
Thanks, I use AutoCAD at work, although not full-time. I have not done any 3D work on it yet - we also have Solidworks for compatibility with a customer, but I do not have access to that software. Would you be prepared to share the AutoCAD files with others for reference? I would fully understand if you prefer not to, as I appreciate the amount of work that will have gone into creating them.
Cheers, Andy
Automotive Stud
Well-known member
I installed the Mitchell with the 36% overdrive in my '47 coupe with 3:78 gears and I love it! I used the cable shift setup, so I have a '49 Overdrive T handle mounted under the dash. I did have to notch the floor very slightly under the back seat, the forward edge of the overdrive would hit the floor on bumps. It was very easy to install, but I can't give much of an idea on time, mainly because I opted to rebuild the rear springs and add spring lining while it was all apart. I also replaced the clutch and rebuilt the transmission while I had everything out. I have pictures I can post if anyone is interested.
FlatheadTed
Well-known member
FlatheadTed
Well-known member
This unit is more or less the same as 40 pick-up .You will note the extended casting out the rear,As i understand it this is required for a oil reservoir for cooling .Has 40 pick up had any issues here ,
flatmotor40
Well-known member
I moved the shifter bar on the OD to the bottom and that did away with hitting the floor.It makes teh cable push in to get OD pull out and you are out of OD
Automotive Stud
Well-known member
Ok here are some pictures of when I put it in my '47 coupe. As you can see from the one picture it was close to the floor pan. I thought it would clear, which it did until you hit a bump. So you can see how I had to notch the floor under the rear seat for clearance. Now I've had no problems at all. I would definately use one again.
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40Pickup
Senior Member
Yes you have a point here! Well .. measured the oil level in the O / D when it was installed to Volvo gearbox, (they share the oil) came to the conclusion that the oil level was not high in the O / D and the amount of oil was low. I thought, can this work? Maybe I had to make an external oil tank, but have run now for two years without any problems. If I have calculated oil level right, so it must be raised much for reaching out to the extended reservoir. That's an advantage with larger quantities of oil just to keep down the temperature, so I think you're right here. I thought, is it a disadvantage to the high oil level?
/40Pickup