07-30-2012, 07:33 PM | #161 | |
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Re: F150 tranny with overdrive
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07-30-2012, 07:40 PM | #162 |
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Re: F150 tranny with overdrive
there are many disscussions on this ,ive done these for over 20 years,and figure .725= 28% o.d. the books call it 37% go figure?
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07-30-2012, 08:23 PM | #163 |
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Re: F150 tranny with overdrive
Thanks for the information will try to swap out the gears called cobra transmission today they are suspoist to get back with me any one have a cluster geer and fourth laying around would be intersted thanks
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07-30-2012, 08:57 PM | #164 |
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Re: F150 tranny with overdrive
,if you want the .28% you will need an input shaft, overdrive gear and cluster. 22% you will need an overdrive gear and cluster. (both not easy to find) i have a complete 22% o.d. kit for sale,$2975.00+ shipping, (paypal only)
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07-30-2012, 09:47 PM | #165 |
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Re: F150 tranny with overdrive
Just curious, Miss Victoria, where are you located?
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07-30-2012, 10:03 PM | #166 |
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Re: F150 tranny with overdrive
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08-01-2012, 08:26 AM | #167 |
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Re: F150 tranny with overdrive
miss victoria, I think the way you're calculating the OD percentage is totally wrong. A transmission with a .7246 OD ratio means the engine turns .7246 revolutions and the drive shaft turns 1 revolution. So, when the engine has turned 1 full revolution, the drive shaft has turned 1.38007 revolutions. It is overdriven by 38%. So, a final OD ratio of .7837 = 27.6% and .7087 = 41.1%. There isn't a 22% OD transmission for that F150 tremec transmission. Please see my chart (post #8) earlier in this thread .
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AL in NY Last edited by AL in NY; 08-01-2012 at 01:21 PM. |
08-01-2012, 08:45 AM | #168 |
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Re: F150 tranny with overdrive
chiliman, you may want to look into the 41.1% transmission further. The gear ratios in that transmission are; 1st = 3.006, 2nd =1.776, 3rd = 1.00 and fourth is .7087. Now if you do the math, with a 4.11 rear end ratio, the final drive ratios are 1st =12.35, 2nd =7.29, 3rd = 4.11 and fourth is 2.91. Compare this to a 3.78 rear and the 27.6% OD transmission and you get 1st = 12.28, 2nd = 7.25, 3rd = 3.78 and fourth is 2.96. Looks like the only big difference is 3rd gear, 4.11 verses 3.78. Using the 41.1% transmission is going to be way cheaper than buying all the guts you'll need to change it to a 27.6% OD transmission.
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08-01-2012, 01:17 PM | #169 |
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Re: F150 tranny with overdrive
Sorry al i dont agree with you ,no one i know that used that o.d. Raito liked it. I throw those gear sets away.
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08-01-2012, 01:22 PM | #170 |
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Re: F150 tranny with overdrive
Talk to me, then that will ruin your 100% record!
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08-01-2012, 03:01 PM | #171 |
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Re: F150 tranny with overdrive
Al in NY thanks for the in formation sounds like 41% with 411 rear end may be the way to go I have one of them scoped out for 200 dollars pulled the top off today at the reabilders gears all look good he is gona be ording the rebuild kit bearings scrnozer and shaft I may try it with the 378 rear first but Im thinking it wont have much power will keep you informed thanks agin
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08-01-2012, 03:52 PM | #172 |
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Re: F150 tranny with overdrive
miss victoria, I wasn't recommending the 41.1% OD transmission, just trying to show you the correct way to calculate OD percentage.
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08-01-2012, 05:23 PM | #173 | |
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Re: F150 tranny with overdrive
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08-01-2012, 07:19 PM | #174 |
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Re: F150 tranny with overdrive
I have been building thes F150 transmiissions for Model A Fords since 1998. I know these gear sets too. Al has the information right on the way to figure the OD %. Subtracting the .70 or .72 or .78 from 100 does not give a true OD %. Subrtacting onlly gives one a numerical figure not a %.
BTW I do not recommend the 41% for the Model A. The 37% only in very special conditions. I drive a 31 Model A coupe with the 27% and a 31 S/W Fordor with a 27% as well as a speedster with the same tranny. I love the combo in all three cars. |
08-02-2012, 10:58 AM | #175 |
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Re: F150 tranny with overdrive
The $500 price tag is probably why using the AA bell housing and fabricating a pedal mount is why the guys making the kits do it that way.
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08-03-2012, 03:57 PM | #176 |
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Re: F150 tranny with overdrive
CarlG What % transmission you running and with what rear end? thanks
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08-03-2012, 04:44 PM | #177 |
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Re: F150 tranny with overdrive
4th gear (Overdrive) is .78 which is either 22% or 27% depending on whose math method you use. The rear end ratio is stock Model A, which I believe is 3.78
From my experience, which is only about 1,500 miles, this combination is very acceptable, runs well under 2,000 rpm at 55mph. |
08-03-2012, 07:21 PM | #178 |
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Re: F150 tranny with overdrive
thanks for the information
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08-06-2012, 03:29 PM | #179 |
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Re: F150 tranny with overdrive
Next question.... the adaptor plate to mount the torque tube to the trans... is this available, or does it need to be custom made? Also the u-joint... what is used here?
Thanks, Marty. |
08-06-2012, 06:00 PM | #180 |
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Re: F150 tranny with overdrive
There are kits avail from diff venues for this conversion, either 3 spd or 5 spd. Some require frame mods, some open drive, some closed drive. There's an ad for the conv in every hemmings mag, also ck on the HAMB.
Paul in CT |
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