Manual tranny options for swap on my '86 6.9L IDI - Diesel Forum - TheDieselStop.com
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post #1 of 4 (permalink) Old 09-28-2018, 04:01 PM Thread Starter
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Manual tranny options for swap on my '86 6.9L IDI

I’ve picked up an 86 6.9 with a full bio diesel conversion kit and a 4 speed! It gets outstanding fuel mileage but I don’t like the high rpms I’m running on the highway! What’s my options? Would prefer the fastest swap as this is my daily
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post #2 of 4 (permalink) Old 09-28-2018, 07:02 PM
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Find out what rear end gear ratio you have and then find a higher one. Swapping the rear end out would be close to the fastest bolt in that you could do.

A different transmission isn't going to do very much for you unless you go to a overdrive unit and then you are fighting drive line lengths.

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post #3 of 4 (permalink) Old 09-28-2018, 11:38 PM
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I agree - I'd be looking for a higher (numerically lower) RAR. Higher gears are physically stronger, anyway.

But this shows a few older stickshifts that might fit:


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post #4 of 4 (permalink) Old 10-08-2018, 10:07 AM
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The easiest bolt-on would be taller tires. You don't list a location so watch the emission laws.
If you have the 4:11 rear-end then the 3:55 is a bolt-in option.
Ford offered an option of a ZF-5 transmission for the 1987 6.9 and the later 7.3's. Like your T-19 4-speed, the ZF-5 needs to be for a diesel engine, but it is a bolt-in option.
Take note, in addition to the gas and diesel versions, the ZF-5 came in 2-wheel and 4-wheel versions.
Then there are the auxiliary transmissions like the DNE-2 I have, it adds an over-drive to each of my 4 gears.

Red 86 F250 Supercab XLT: Longbed, 6.9l, 4 speed with DNE-2 Overdrive, 2WD, 10.25 Sterling 4:11, Reclining Highback Captains chairs with arm-rest, Holly Red pump, push-button glowplugs, Racor 645 water separator with fuel heater, K&N Air Filter, Headlight Relay Upgrade, Fog Lights, lots of extra lights, Isspro EV series: Pyro, Oil Pressure, and Voltage in a Autometer 3 pod A-pillar. Bulldog Security System with remote entry. Offset Mirror Upgrade, Remote lube TOB. Road Watch System coming soon. PB PS PW PDL CC AC IW
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Last edited by Joe Mc; 10-08-2018 at 10:10 AM.
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