- 518
- 179
- 43
- Location
- Stoneville, NC
I have edited the original post with updated information. The gear ratios posted previously do not appear correct. I took the serial # off mine and called back to ask again. They quoted me the gear ratios for a 3000 series transmission and said there wasn't much information on the MD3070PT. They could not give me the gear ratio for the 1st gear, which is in the transfer case. Anyway, here are the ratios:
1st - unknown, not listed
2nd - 3.49
3rd - 1.86
4th - 1.41
5th - 1
6th - .75
7th - .65
Reverse: -.509
What fluid is best to run in the transmission? A: Allison/Castrol Transynd. I asked about other fluid choices, and was told that Dex III is a step up from the 15w-40, and the Transynd is the best. They said NOT to use Dex 6 as that will cause the seals to harden.
The technician also talked about how time alone (and not just mileage) will deteriorate the fluid. The transmission has a breather tube, which will let moisture in. This mixes with the fluid and forms an acid. The technician said he hoped they had changed the fluid regularly due to this deterioration.
Here is some info I found online: View attachment MT2923EN.pdf
1st - unknown, not listed
2nd - 3.49
3rd - 1.86
4th - 1.41
5th - 1
6th - .75
7th - .65
Reverse: -.509
What fluid is best to run in the transmission? A: Allison/Castrol Transynd. I asked about other fluid choices, and was told that Dex III is a step up from the 15w-40, and the Transynd is the best. They said NOT to use Dex 6 as that will cause the seals to harden.
The technician also talked about how time alone (and not just mileage) will deteriorate the fluid. The transmission has a breather tube, which will let moisture in. This mixes with the fluid and forms an acid. The technician said he hoped they had changed the fluid regularly due to this deterioration.
Here is some info I found online: View attachment MT2923EN.pdf
Last edited: