allison performance ???
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09-07-2005, 02:48
Post: #1
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allison performance ???
Hello all I am looking for some help with a allison 643 transmision, I
am very peticular and it is starting to bother me a bit. We are getting some weird shifts on our bird right now, 1st to second is fine and firm, 3rd to 4th is some what troubling on the climb through the rpm range, I get a rpm change 2 times before shifting into 4th gear. It is almost acting like it has 5 gears, is this the torque converter locking up in the 3rd gear range? then shifting to 4th? I guess I think it should just shift 1..2...3....4. I have checked the shift points compared to rpm to speed and they are right on. this trans is the allison MT643 not 640 Mac and Carrie Good 1978 31' FC NA |
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Messages In This Thread |
allison performance ??? - mad6mac2000 - 09-07-2005 02:48
allison performance ??? - dthollis1961 - 09-07-2005, 02:53
allison performance ??? - Mike Hohnstein - 09-07-2005, 03:22
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