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Transmission banging

CES 3245th

Member
102
0
16
Location
Boston Ma
I have a 1983 M923A1 with an Allison automatic transmission 5 speed. When coming to a stop with this truck at a light or in traffic it always bangs when it downshifts. I am not manually downshifting this is doing it by itself. Is this the norm for this type of truck and transmission? I currently run 15w40 motor oil. I realize there is a lot of debate on this on what type of fluid to use motor oil or Dexron. The winters in the Northeast are pretty cold here obviously not as cold as the Great Lakes area but it’s cold. I’m sure the temperature in this area has a determining factor on what type of fluid to use in the transmission .So, what I’m trying to figure out is how to keep this transmission from banging when coming to a stop. Any input on this subject would be greatly appreciated
 

URSATDX

Member
138
18
18
Location
So Jersey, NJ
My A3 w the Allison 4 spd has similar characteristics when downshifting. Especially 2nd to 1st.
It's less noticeable when trans temps increase or when pulling a load.
Lots of info/discussion here on 1540 vs ATF.
Mine is currently using 1540.
 

CES 3245th

Member
102
0
16
Location
Boston Ma
simp5782, thank you for that info. Have you or anybody you know ever install this heavier spring on M923A1 and did it resolve the banging noise coming from the transmission? I hate to ask, is this easy install, or am I in for a tough day on this install?
 

simp5782

Feo, Fuerte y Formal
Supporting Vendor
12,091
9,248
113
Location
Mason, TN
simp5782, thank you for that info. Have you or anybody you know ever install this heavier spring on M923A1 and did it resolve the banging noise coming from the transmission? I hate to ask, is this easy install, or am I in for a tough day on this install?
Takes about 15mins. Simple. Profo did it on his A2 and it solved it. I had it on mine as well when I had an allison

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