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Thread: Swapping speedo gear??
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04-22-2010 #1
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Swapping speedo gear??
Anyone know what is involved in swapping out the colored plastic speedo gear in a TH400? My speedo is reading about 10mph high for my 3.31 rear gear and 18" rims.
69 SS396 Camaro Coupe, 4link, 12bolt posi, Speedtech LCA and UCA's, Hotchkis 2" drop springs and sway bar, QA'1's, Bilsteins, Wilwood 6 piston front/4 piston rear, Magnaflow stainless exhaust, Lemons Headers, Comp rollers/p-rods/cam, Fikse 18x8.5 and 18x10
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04-22-2010 #2
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First, you'll need to pick the right speedo gear. Figure out the ratio of how much higher (or lower) your speedo is reading. What gears did you previously have? What tire size was originally meant to be on your car and what do you have now?
Brett H.
1979 Pontiac Firebird Trans Am
1991 Mazda Miata
2005 Ford Mustang GT
1987 Ford Mustang GT - Sold 06-29-2014
1988 Oldsmobile Cutlass Ciera - RIP 9-17-2011
1992 Chevrolet Corvette - Sold 10-12-2017
04-22-2010 #3
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The trans was swapped out at some point and replaced with an early 70's unit from a caprice/impala. I have no idea what is in there now. I have no idea what tooth count would be correct. Stock were original steel 14" wheels with 3.31 rear gear (still original). Only thing ever changed was the TH400 itself.
Originally Posted by 79-TA
69 SS396 Camaro Coupe, 4link, 12bolt posi, Speedtech LCA and UCA's, Hotchkis 2" drop springs and sway bar, QA'1's, Bilsteins, Wilwood 6 piston front/4 piston rear, Magnaflow stainless exhaust, Lemons Headers, Comp rollers/p-rods/cam, Fikse 18x8.5 and 18x10
04-22-2010 #4
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They are sold by color. Check whaty you have now and reference the index for the right color.
Nick R.
69 Camaro - 383, 700R4, 12 bolt 3.55, Hotchkis, Bilstein, Global West, Morris Classic
08 HHR SS - Still Stock for now
Do you still believe in all the things that you stood by before? Are you out there on the front lines, or at home keeping score?
Do you care to be the layer of the bricks that seal your fate? Would you rather be the architect of what we might create?
04-23-2010 #5
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But how do I get the current gear out?
69 SS396 Camaro Coupe, 4link, 12bolt posi, Speedtech LCA and UCA's, Hotchkis 2" drop springs and sway bar, QA'1's, Bilsteins, Wilwood 6 piston front/4 piston rear, Magnaflow stainless exhaust, Lemons Headers, Comp rollers/p-rods/cam, Fikse 18x8.5 and 18x10
04-23-2010 #6
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One bolt holds the retainer in place. It usually requires loosening the bolt, sliding the retainer back (the hole is slotted) and pulling the unit out. Really easy. One suggestion is to jack the rear of the car up rather than the front so as to not push fluid out the opening. If it is angled nose down there shjouldn't be more than a few drops of fluid spilled, have a rag handy either way.
Nick R.
69 Camaro - 383, 700R4, 12 bolt 3.55, Hotchkis, Bilstein, Global West, Morris Classic
08 HHR SS - Still Stock for now
Do you still believe in all the things that you stood by before? Are you out there on the front lines, or at home keeping score?
Do you care to be the layer of the bricks that seal your fate? Would you rather be the architect of what we might create?
04-30-2010 #7
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This might be a little late but here's a link that is helpful in calibrating your speedo
http://www.transmissioncenter.net/sp...FSBqswodgwv6ZQ
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