Jeepsinker
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58? 55? Man, yall's trucks are slow...
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M109a4 /a3: Reducing rpms, gaining speed / tranny / gearing solution & crowd sourcin
- Thread starter ZombieRV
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that is what i am thinking, i ran 70 for 5 hrs a few mths ago. high idle on my 9.0 is 3000 rpm and it is rated that for continuous use, have never run it up that fast yet.
quickfarms
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55 mph is the three axle truck, or any trailer, speed limit here in CA.58? 55? Man, yall's trucks are slow...
Now I have a two axle truck in the shop that should be capable of triple digit speed once we are done with it.
Jeepsinker
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Oh darn, yeah I didn't realize that. Man o' man, Kalifornia.... I'm sorry.
rustystud
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The only difference between the MT653 and the MT643 is the low reverse clutch pack as the 653 is a 5 speed and the 643 is a 4 speed. The clutch adds to the extra length. Both can come with a SAE 2 or 3 bellhousing . It is NOT a discontinued transmission. Both have lock-up torque converters and both are a 1:1 ratio at top speed. I have rebuilt plenty of these transmissions and many trucks and busses still use them. The AT, MT, and HT series transmissions are decades old but still used today. In fact our new wrecker came with a HT754DR. DR stands for "deep ratio" and the CR stands for "close ratio" . This is for the first gear. So a MT653DR is a 5 speed with a really low first gear.
quickfarms
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It can actually be an nice advantage when driving on the freeway in an older vehicle that can at least do 55. I have found my self in the right lane with an 80,000 lb battering ram protecting my six from the crazy four wheelers or weekend warriors. I had a bob tail jump in front of me to protect me from the toy hauler that tried to pass on the right and lost it in the dirt.
Jeepsinker
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Tom, will the multifuel flywheel bolt onto the 3116, or will he have to get one that is made for the 3116?
rustystud
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I decided to post this picture showing a Spicer 3053 manual transmission and a Allison MT654CR automatic transmission. You can see that the Allison is way to long and big to fit behind our multifuel engines. Even if you went with the 4 speed MT643CR it would be to long and big !
I was going to use the MT654CR in one of my Tractor trucks but decided to stay with the 5 speed manual that is already in it.
rustystud
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As long as the AT1545 locks in 3 and 4 it would operate the same.
I forgot to mention that the AT500 series (which the AT1545 belongs to) transmission does not have a lock-up torque converter, nor does any of the gears lock-up like the larger transmissions do. Basically the AT500 transmission is just a TH400 on steroids. In fact the direct and fourth gears clutches are the same as the TH400 direct and forward clutches. We used to use AT500 series clutches in the TH400 to help beef it up as the clutches in the AT500 where made from a asbestos type of material which could handle the heat better.
I forgot to mention that the AT500 series (which the AT1545 belongs to) transmission does not have a lock-up torque converter, nor does any of the gears lock-up like the larger transmissions do. Basically the AT500 transmission is just a TH400 on steroids. In fact the direct and fourth gears clutches are the same as the TH400 direct and forward clutches. We used to use AT500 series clutches in the TH400 to help beef it up as the clutches in the AT500 where made from a asbestos type of material which could handle the heat better.
HanksDeuce
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I love my AT545. Don't really care about that haters.
Jeepsinker
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Your just too lazy to shift!
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It's 6 vs 8 mounting bolt-holes:
MF
CAT
He will need a 17" flywheel like this one:
G.
rustystud
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Who said anything about hating the AT545 ? I love those Allisons ! I wouldn't have worked for them if I didn't like them. I would still love to put one in my 1 Ton truck someday. I just cannot fit that MT654CR into my deuce without removing a lot of stuff and pushing the transfer-case back about 15" . Remember my specialty was automatic transmission repair, because I love them ! Actually my shop specialty was "gear repair" I just loved working on the automatics better.I love my AT545. Don't really care about that haters.
HanksDeuce
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My post wasn't directed at you rustystud.
rustystud
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My misunderstanding. I thought since my last post mentioned the AT500 series you where thinking about me. I guess if you think about that, it makes me kinda conceited ! Why would you want to think about me ? I think my pain killer has kicked in !My post wasn't directed at you rustystud.