>>>>>>>dana 300 t/case question<<<<<<<< - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 07-02-2001, 10:47 AM
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>>>>>>>dana 300 t/case question<<<<<<<<

i have dana 300 but am unsure of its age if it is a 1980 then the 4:1 gear set wont work in it because of the shorter output. i have all the numbers off it but none seem to correlate to a date
and i want to be able to use a different gear set instead of changing my r&p


[email protected],

schaan

1980 CJ7 75% completed
1969 Early Bronco 40% completed
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post #2 of (permalink) Old 07-02-2001, 02:00 PM
 
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Re: >>>>>>>dana 300 t/case question<<<<<<<<

The gear sets (including Tera-Lo) are interchangable including a 1980.
The only difference in a 1980 'shortie' is the rear shaft from the rear output inner bearing to the yoke.
It takes a different rear inner bearing but uses the same race as the newer unit.
It has a round rear housing vs. a 'Texas' pattern.
And it has a Dana 20 style screw in type of speedo connection vs. a dial and fork style.

JAF
http://www.monsterslayer.com/jeep
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post #3 of (permalink) Old 07-02-2001, 02:52 PM
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Re: >>>>>>>dana 300 t/case question<<<<<<<<

i thought all d300's had the round pattern. what would the internal differences be between the 80 model and the later ones so that the advance adapter hd output shaft won't work with the 80 model?

brian wilson
80 cj5 "high 5"
stretched to 100" wb
vortec350/4L80E/d300/d60fr/14br/detroits/4.56/38's
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post #4 of (permalink) Old 07-03-2001, 09:25 AM
 
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Re: >>>>>>>dana 300 t/case question<<<<<<<<

Brian-
If you will re-read, I said "It has a round rear housing vs. a 'Texas' pattern."
Both have the same round front mating pattern but the rear bearing retainer patterns are different. The '80 is round but when in '81 the dial and fork style speedo connection was introduced the rear retainer pattern was changed to a 'Texas' style due to the bulk involved with the speedo gear mechanism.
Dan Pawlic, the guy did the cryo hardening for my D300 shafts, has swaped rear retainers by drilling the case. The 'Texas' bolt farther out (and farther in, I believe he told me, for the '80 retainer) since there is enough gasket seat area there for either.
That is the only modification you'd need to make to put the AA rear output on an '80 case BUT the later cases are easy to find ... so why bother?
I've seen piles of cases around here that have been robbed of their input and output shafts.
The big problem there lies in that you'd loose the precious 1"+ that the 'shortie' TC offers which can become critical in a short wheel based CJ-5.
I almost went with the 'shortie' in my rig but changed my mind once I realized that if I started having rear output breakage problems (the biggest short coming of the D300) I'd be screwed if I wanted to then go with an AA upgrade since I'd then have to change the rear drive shaft length and even rear axel pinion angle if I did it.


JAF
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post #5 of (permalink) Old 07-03-2001, 11:39 AM
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Re: >>>>>>>dana 300 t/case question<<<<<<<<

jaffer, thanks for the good info. i have 2 short shaft d300's and i used to have a long one too but i sold it and i didn't pay close enough attn to them to see the differences when i had them. i havn't broken an output shaft yet but i was just wondering just incase i ever do. thanks again

brian wilson
80 cj5 "high 5"
stretched to 100" wb
vortec350/4L80E/d300/d60fr/14br/detroits/4.56/38's
post #6 of (permalink) Old 07-03-2001, 06:06 PM
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Re: >>>>>>>dana 300 t/case question<<<<<<<<

thanks JAF does that mean it will or wont work?

do i need to specify that it is a "shortie"
are these more desireable because of the ability to use a longer driveshaft ( rear )


[email protected],

schaan

1980 CJ7 75% completed
1969 Early Bronco 40% completed
post #7 of (permalink) Old 07-03-2001, 06:06 PM
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Re: >>>>>>>dana 300 t/case question<<<<<<<<

thanks JAF does that mean it will or wont work?

do i need to specify that it is a "shortie"
are these more desireable because of the ability to use a longer driveshaft ( rear )


[email protected],

schaan

1980 CJ7 75% completed
1969 Early Bronco 40% completed
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