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Old 09-14-2008, 08:14 PM
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trans tunnel clearance?

I have a '39 Ford two door sedan sitting on as S10 Blazer frame. I made a floorboard super structure out of one inch tubing. I bought a universal trans tunnel and wonder how much clearance there should be between the trans and the tunnel. I'm thinking at least two inches. Am I close? Thanks in advance, Rod

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Old 09-14-2008, 08:19 PM
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Moving to general rodding tech..

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Old 09-14-2008, 10:23 PM
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I usually try for one inch clearance ... have not had any problems with any of my builds.





I dislike a big, over sized tunnel. On a 39 Ford ... it would not be as bad as in a 32 Ford. The smaller the tunnel, the easier it is to get the accelerator over further away from the brake pedal and the steering column.



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Old 09-15-2008, 12:21 AM
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Hey Deuce, I like that picture of a wadded up moving blanket you used as a trans tunnel...Now that's being resourceful


2 inches is too much. No pedal room. Maybe at the top it would be ok, but at the sides it would cause problems.

I build them with no less than 1/2" clearance from any point on the trans or associated parts. Nothing ever rattles with 1/2" clearance, as far as I know.( hit a bump that will shake the body and motor on their mounts enough to move them 1/2" and the sound of the trans hitting the floor is much quieter than the sound of your head hitting the roof )


Try laying some 1/4 or 5/16 ID rubber hose over the trans, tape it down, then let the tunnel rest on it while you fit it to the floor.

Later, mikey
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Old 09-15-2008, 06:42 AM
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Quote:
Originally Posted by powerrodsmike
Hey Deuce, I like that picture of a wadded up moving blanket you used as a trans tunnel...Now that's being resourceful
I was trying to show the accelerator pedal being over some and NOT jammed up against the brake pedal. But a 39 does have a wider area to deal with than a Deuce
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Old 09-15-2008, 06:47 AM
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Quote:
Originally Posted by powerrodsmike
Hey Deuce, I like that picture of a wadded up moving blanket you used as a trans tunnel...
Mikey,

That's no moving blanket...that's some sort of well disguised terrorist bomb. Note the electronic detonating device hooked up to it on the right. (Um, or maybe it's just an electric blanket to pre heat his transmission.)

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Old 09-15-2008, 07:30 PM
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Thanks guys

Thanks, Duece and powerrodsmike for the advice. Thanks for the pictures, Deuce. You've both been very helpful. I'll try the hose thing. It sounds like it would work. Thanks again, Rod
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Old 09-16-2008, 03:30 PM
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"Try laying some 1/4 or 5/16 ID rubber hose over the trans, tape it down, then let the tunnel rest on it while you fit it to the floor."

Excellent!!
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Old 09-16-2008, 04:03 PM
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That's a trick I learned from the custom motorcycle guys...that's how you position a snug fitting front fender to mount it and maintain enough tire clearance so a rock caught in the tread does not wipe out the paint when it cuts a dent from the inside out of the fender as it rolls through.

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Old 09-20-2008, 10:56 AM
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thanks again

Thanks for the comment, techinspector1. Sounds like a plan, Rod
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Old 09-20-2008, 12:28 PM
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suggestion:

think ahead a step, to be sure you won't run into exhaust pipes/downshift linkage/etc interference....

there is alot of radiant engine and pipes btu's heat that wants to come up thru that big panel into the cab.....
I'd consider making a good part of it a double wall with a open air gap to keep the heat out of the cab....

1/2" to the reflector panel and 1/4-1/2" gap from that to the cab panel is more than plenty good for reflecting/losing 90% of the heat (same as a steel fireplace metal chimney construction)

Last edited by red65mustang; 09-20-2008 at 04:26 PM.
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Old 09-21-2008, 07:14 PM
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It's interesting to note that when us hotrodders build a car, we normally start with the frame and then find a place for everything. When purpose-built tube frame cars are put together, all the components are hung in space at the appropriate positions in the car, then the frame is constructed with curves, bends and whatever else to intersect the components and tie them in. In other words, the frame is the last thing that goes into the car.
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Old 09-25-2008, 06:44 PM
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Thanks again

Thanks, red65mustang, I hadn't thought about the heat factor yet, but I'll have to. techinspector1, that's an interesting concept about building a frame around an interior, amazing. Thanks to both of you, Rod
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Old 09-26-2008, 11:34 AM
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Rod,
on the behalf of all who posted, thank you for saying thanks and your welcome...
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Old 10-04-2008, 08:12 PM
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On manual transmissions with floor mounted shifters, I just make a removable cover that comes completely up and out to service/adjust the clutch, shifter, and rods.. If a rollover mounted trans is used you can also service the trans.
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