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#1
10-15-2006, 04:24 PM
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450SL shift problem
I got my '76 450SL engine to run and now I need help on my '77 450SL (doesn't everyone have 2 SL's?). This is a good one BUT the 2-3 upshift will not occur until the system is thoroughly warmed up. I know my SubaruXT had a "thermal switch" in the transmission to lock out 3-4 upshift when cold. Once warm the '77 works fine. If the transmission must come out will a newer 4-speed auto work or is it sacrilege to consider this?
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#2
10-15-2006, 07:15 PM
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The 4-speed auto (from an aluminum-block V8) won't swap directly on because the bellhousing is much bigger on the cast block. I would TRY to adapt it if I were you, though. MAYBE the bellhousings can be swapped? I have never heard of this done.
If your 1-2 upshift is also very delayed, it could be that your kickdown switch has a short in it.
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Current: 2021 Charger Scat Pack Widebody "Sinabee" 2018 Durango R/T Previous: 1972 280SE 4.5 2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi" 1999 Chrysler 300M - RIP @ 221k Last edited by Tomguy; 10-16-2006 at 12:27 AM.
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#3
10-15-2006, 09:32 PM
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The symptoms you have are classic stuck valves, governor or valve body. To service the governor the tail must be removed.
This is what I would do if the car was my shop, check the level and condition of the fluid if clean with no burnt smell; I would drive it until it reaches operating temperature, then do a road test to check for any slippage, kick down up shifts and down shifts. If the transmission performs to my satisfaction, I would flush it and add a friction modifier/cleaner, Lube Guard. Don’t believe the Flush misinformation in cyber space, most of it is BS, if a transmission fails after a flush it would have fail with out one.
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