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Old 11-26-2019, 11:17 AM   #1
Hyvolt
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Default Ford tremec rts t170 transmission

Selling for a friend. Reported to be rebuilt. Came from 88 f150 with the 300 six. Has desirable ak gear set. Call number attached, Larry. Located in Dittmer Mo. Not willing to ship at this time. Shifter is approximately 15 inches from front of stock bellhousing.

Larry 314-277-4609
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Old 11-26-2019, 12:36 PM   #2
rotorwrench
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Default Re: Ford tremec rts t170 transmission

I would prefer the Type B gearset myself. It has the 26.7% OD. The AK is a Type C gearset and it has the 37.9% OD. To each their own. The last use by Ford was in early 1987.

There is a swap meet part to this forum and folks do check it.
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Old 11-26-2019, 12:45 PM   #3
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Default Re: Ford tremec rts t170 transmission

I was going of different info, ( as far as ratios are concerned)either way I didn't intend on putting this add here, but now I can't seem to get it moved. Any suggestions?
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Old 11-26-2019, 12:55 PM   #4
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Default Re: Ford tremec rts t170 transmission

Correct me if I'm wrong, but with 4th gear being .7246, should not that be 27% od
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Old 11-26-2019, 03:36 PM   #5
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Default Re: Ford tremec rts t170 transmission

The 26.7 % equals .7837 ratio. It feel more like just changing up another gear from 3rd. The other two common sets have more space or a longer step between gears. They all work but some can feel like you went from 2nd to 4th and skipped a gear.
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Old 11-26-2019, 04:26 PM   #6
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Default Re: Ford tremec rts t170 transmission

Rotor, how do you do that math? I have wondered what the Mitchell overdrive 26% and 36% ratios convert to.
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Old 11-26-2019, 06:57 PM   #7
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Default Re: Ford tremec rts t170 transmission

I didn't do the math. I just looked in my T170 TOD manual that Ford issued for these transmissions. There is a thread on here where some folks discussed this conversion but it's been a while. They generally express it in percentage so folks don't get confused about the drop in ratio.
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Old 11-26-2019, 07:12 PM   #8
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Default Re: Ford tremec rts t170 transmission

It's been a long time since I was in math class, but wouldn't the overdrive percentage be the reciprocal of the high gear ratio minus 1?

1/.7837=1.276

1/.7246=1.380

Last edited by tubman; 11-26-2019 at 07:17 PM.
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Old 11-26-2019, 08:28 PM   #9
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Default Re: Ford tremec rts t170 transmission

This is the info that I have on the T170.
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Old 11-26-2019, 08:46 PM   #10
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Default Re: Ford tremec rts t170 transmission

frnkeore's table seems to confirm tubman's formula. so: 1/1.26= .79365 and 1/1.36=.7353 for the ratios of the Mitchell overdrive. They aren't as far apart as I suspected. I'm glad to get that settled in my mind.
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Old 11-27-2019, 10:05 AM   #11
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Default Re: Ford tremec rts t170 transmission

My information differs from the table in post #9. It lists the B series gear set as 26.7% so someone got the math wrong on the chart I have. They likely transposed the 6 & 7 by mistake.
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Old 11-27-2019, 12:25 PM   #12
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Default Re: Ford tremec rts t170 transmission

I have one of these in my truck. Just love it, easiest and cheapest instolation I ever made. Jut bores out the regester on a stamped steel bell housing, welded on some tabs and bolted it. Just used a new clutch disk, Have 3.73 in the rear (Spicer 44 w/posi). Great combination, well worth the effort.
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