Tranny ratio.

[ken]

Can anyone tell me what the 5th gear ratio is? O.D.? or direct? If O.D. how much?

 

[cranetruck]

Ken, which transmission?

 

[Trango]

I got a 6855 that was reportedly from a military 5 ton. It's a .695 OD 5th gear.

Bob

 

[ken]

Bjorn, I don't know what tranny it is, But i do know it has a 465 multi-fuel. Did that engine only use 1 transmission?

 

[Recovry4x4]

Probably used the 6453 as the gassers used the 6352. Going by memory here gang!

 

[Squirt-Truck]

If it is from a 5-ton, the gas engine and the multi-fuels used the same transmisison, (6352), the Mack and Cummins used the OD transmission (6453). The OD is 0.78:1. Both are Spicers.
The direct transmission is the working unit, the gear ratios are better spaced, the OD gives better road speed, for the lower RPM engines, but is not as good a worker due to the uneven gear spacing especially 3 to 4.

 

[ken]

Will the 6453 fit the back of a 465 multifuel? And does anyone know the 1st gear ratios on the 6352 and the 6453?
Thanks

 

[red devils dude]

here Spicer 6352 (5 speed manual, 1st=7.31, 2nd=4.08, 3rd=2.41, 4th=1.43, 5th=1.00, Rev=7.33)

 

[ken]

Thanks jed. Does anyone know who i could contact to get the 6453's first gear ratio?

 

[Junkyard Wars Crusher]

Ahhhh, . . . finally, a question I can answer.

The 6453 was used in the -A1 M39 Series 5-tons. The M39 series is also known as the G744 series, and includes such trucks as the M51 Dump (like mine), M52 Tractor, M54/M55 Cargo, M62/M543 Wrecker, etc.

The -A1 was a MACK diesel (ENDT-673) that superseded the Continental Gas 6602 and preceded the LDS-465 multifuel (-A2 series). I'm not sure what years the Mack was produced, but IMHO they seem to be quite obscure.

(A side note: The 6602 gas and the LDS-465 multifuel both used the 6352 transmission)
Sorry if that summary is remedial for most of you.

Anyway, I found the ratios you are looking for in TM 9-2320-211-20 (5-ton series):
6453
1st - 6.07
2nd - 3.40
3rd - 1.79
4th - 1.00
5th - .78
Rev - 6.09


In case you were wondering about some specs on the Mack ENDT-673, I offer the following (again from TM 9-2320-211-20):
Brake Horsepower - 205 @ 2,100 rpm
Compression Ratio - 16.50:1
Compression Pressure - 575 psi @ 1,000 rpm
Maximum Torque - 560 ft/lb @ 1,400-1,600 rpm (gross) and - 529 ft/lb @ 1,400-1,600 rpm (net)


I have been meaning to upload some 5-ton manuals for Mike to add to the TM library,
. . . guess now is a good time, huh?

 

[red devils dude]

thanks Junkyard Wars Crusher I just couldn't find that little bugger.

 

[Junkyard Wars Crusher]

Jed,

Glad to help. . . . now, shouldn't you be out there preping your engine compartment?!?!.
Stop playing on the internet, and get that motor put in !!!!

 

[red devils dude]

Ah ah sir.

 

[ken]

THANK YOU very much! Now i can start looking.

 

[Recovry4x4]

Man I love those ENDT673 trucks. Missed a golden opportunity at getting a 50s M62A1 from Houston Parramore up in the panhandle of FL. Yanno, I've found some cool wreckers down here.