.71 od installed

[m-35tom]

this is sort of a continuation of the gear math subject. today i finished installing the .71 od gears. i am very pleased with the difference. the shift from 4th to 5th is almost the same rpm change as the 3rd to 4th shift, not the puny change we have been used to. and with 14.5r20 (same as 11:00-20) tires, it still has enough guts to tackle my 'test hills' and provide good results. i was suprised at the performance, hard to notice any drop in power or acceleration. there is however one potential problem...... the relative speed of the 2nd gear on the mainshaft to the mainshaft itself is 2622 rpm at engine rpm of 2500. this is likely to cause the 2nd gear to want to seize to the mainshaft. i have heard of this problem when stock trucks are run at max speed, and there appear to be 2 different 2nd gears with the same part number. the older gear has a solid web between the hub and gear while the newer one has 3 large ( maybe 1/2") holes through the web. these are not to be confused with the three oiling holes that are small and go in through the hub to the shaft area. does anyone have any info on when and why this change was made?? or is there any published info on how to solve this lubrication issue?? i am inclined to try putting synthetic atf in the trans and see how it fairs, the 30wt i put in today did not eliminate the problem.

 

[OPCOM]

In reading about automatic transmissions, more oil holes have been drilled in souped up models, but I do not recall if the oiling was pressurized or not.

 

[Recovry4x4]

Wonder od the Lucas oil additive would help? Pretty good stuff!

 

[spicergear]

Good to see that project is moving right alone...no pun intended. My white and blue toy runs atf in the six speed...that tranny runs a 50% overdrive- maybe some notes to be taken there.

Did you happen to pop the top off that other 3053 and see what was clinking?

 

[Stretch44875]

Any chance of us mere mortals acquiring a .71 gear?

Dennis

 

[m-35tom]

dennis the problem so far is that the gears are very obsolete, by more than 40 years, so none are availbale. i am talking to a gear company about making some but they are very slow in giving me a price. just a gut feeling it would cost near $1000 to upgrade a trans. first you need the two gears, second you need to solve the 2nd gear lube problem, which i am sure i can do with some design changes.

tom, someone had pulled the mainshaft out and when you do all the rollers on the front fall out. they just left them in the trans and put more in the head gear when they put it back togeather. the head gear and 4 - 5 syncro were wasted, other wise good for parts. thanks again

 

[clinto]

Tom, at that price, I assume you have searched high and low for a reasonable 6+ gear trans to swap in.......and decided t was not practically feasible?

I care nothing for going faster, or fuel mileage really (My Deuce is better on gas than my Hemi Road Runner was) but I would like to extend the multi's life as far as possible.

 

[Flatlander]

I'm curious, and maybe I missed it, but where did you find these gears? Just so I know what to look for...

Thanks!

 

[devilman96]

Tom,

I would like to take a crack at the 2nd gear oil issue... Images would be a help for the moment outer and inner, as close as possiable with out being a mess... If you have a spare I will pay shipping on it to look at it more closely.

 

[spicergear]

Ah good- glad you can get some parts out of it.

 

[Flatlander]

Ah good- glad you can get some parts out of it.

What's that supposed to mean? I think we're all trying to improve our trucks, here.

 

[cranetruck]

Not being into this, I could however suggest that old manuals are studied for gear ratios etc.

I myself am of the opinion that the step from 3rd to 4th is too big, especially when heavily loaded.

 

[BFR]

yep I kinda wished I had held on to my 3052 for just that reason. especially if I ever jump to 46" tires

 

[Stretch44875]

Hey flatlander, your taking spicergear's comment in the wrong context. He was talking about a transmission he gave to M35-tom for parts.

Dennis

 

[Flatlander]

Whoops, sorry! I thought that was a sarcastic comment....

Spicergear, I apologize.

 

[devilman96]

Tom,

You are already thinkin what I am thinking in reguards to the gear... I would remove the bushing and install needle bearings.

 

[OPCOM]

I spent some time at Inland Truck Parts. We couldn't find anything that would fit in the space lengthwise and was big enough. There probably is something, but whatever it is may not be so common. At one point I'd toyed with an OD for just the rears, but that would be well over the estimated $1K.