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Old 11-26-2002, 08:55 AM
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Post 305 To 350 Swap

Hi I have just recently had my 305 swapped out of my 88 chevy truck and dropped a 350. I had to change the Prom they put the new prom in after doing that they found that the trany was not shifting right and had to disconnect my kick down. They told me that there is no way of fixing that. I was just wondering if they where right or if there is some kind of after marked prom that i could get to replace it. They say I have a 400 Turbo Trany.

Dave

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Old 11-26-2002, 12:57 PM
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What is a prom? School dance? I`m ole so ya gotta teach me stuff!!! Slider in Wa.
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Old 11-26-2002, 01:03 PM
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Computer component.


Kevin
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Old 11-26-2002, 04:35 PM
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Kevin, are those computer compoents call a prom? Slider in Wa. Thanks
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Old 11-26-2002, 04:56 PM
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Dave,

I doubt your rig has a TH400 in it. TH400's use an electrical kickdown under the dash. That trans is NOT interfaced with the ECM in any way so the PROM replacement has dick to do with trans shift.

If your unit uses a kick down cable that affects the shift pattern it may well be a TH700 or TH200 application. They require the cable to be installed so that internal trans pressures are correct. Without it the trans will die.

Sounds like the shop trying to solve your problem needs to go back for some schooling. They seem to subscribe to the old hotrod school, "if one doesn't understand it remove it" and say "nothing can be done about the problem" or 'it will run better without it". Definitely unprofessional. All to many of these types still around.

Don't try to diagnose your problem over the net, you end up getting nothing but guesses at a repair because those involved can't test or drive the rig. You wouldn't take medical advise over the net, why automotive diagnostics. Take it to a reputable tranny shop. You may well have had problems with the trans before you swapped motors, but it took the increased torque to bring the problem to the surface.
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Old 11-26-2002, 05:48 PM
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My kickdown is Electronic i dont know if that matters or not. Trany was just rebuilt this summer I will take it back to the people that rebuilt it and ask them about it and see what they say. I think you are right about the shop needing more schooling. thats why I wanted to see what other people thought about it. Thanks for the help.


Dave
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Old 11-26-2002, 10:02 PM
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PROM --- Programmable Read Only Memory it is a chip ok enough with the computer nerd stuff lol
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Old 11-26-2002, 10:03 PM
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[ November 27, 2002: Message edited by: bluechev4x4 ]</p>
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