stock gear ratio's for 1991 w350? - Dodge Cummins Diesel Forum
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post #1 of 10 (permalink) Old 03-23-2010, 06:06 PM Thread Starter
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stock gear ratio's for 1991 w350?

I have a 1991 W350 picked out to buy, but just want a little more information.

What gear ratio's came in this type of truck? It isn't a dually, just singles on the back.

Also, it is an automatic. Are these automatics 3 speeds or do they have an overdrive?

Lastly, is there a preferred combination in these trucks in terms of reliability? For example transmission types/ gear ratios/ transfer cases?

Sorry for the ignorant questions and thanks in advance for any info. Just want to learn as much as possible about the different drivetrain combos in this year.



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post #2 of 10 (permalink) Old 03-24-2010, 02:10 PM
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Check the axle tag i think it might have 4.10 gears

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post #3 of 10 (permalink) Old 03-24-2010, 08:06 PM
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a stock automatic 91 will have 3:07s in the rear. It is (if stock) a torqueflite 727 which is non overdrive. the lower gears IE 3:54s and 4:10s were only found in trucks with manual tranmissions.

IMO the best setup would be a standard trans with 3:54s

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post #4 of 10 (permalink) Old 03-24-2010, 11:37 PM
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my automatic 1991 w250 has 3.50 gears and overdrive stock. But mine is a 91.5 (intercooled) if yours is the earlier 91 (non-intercooled) it most likely will not have overdrive.

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post #5 of 10 (permalink) Old 03-25-2010, 12:31 AM
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89-91 have a non intercooled engine with a 3 speed with 307 gears. the 91.5-93 have a intercooler and overdrive. not sure about gears on the later years you will have to check the tag

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post #6 of 10 (permalink) Old 03-25-2010, 12:37 AM
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205 transfer case is what it will have and they are pretty darn tough in my opinion

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post #7 of 10 (permalink) Old 03-25-2010, 02:25 AM
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Non Intercooled ratios:

Auto: 3.07 (727 3spd auto)

Manual: 3.54 or 4.10 (5spd Getrag)

Intercooled ratios:

Auto: 3.54 or 4.10 (518 3spd with overdrive auto)

Manual: 3.54 or 4.10 (5spd Getrag)

I've also read that you could order certain intercooled trucks (it may have been only '93) with 3.07 gears. Not 100% on that.

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post #8 of 10 (permalink) Old 03-25-2010, 02:19 PM
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If your options sticker is still there on your hood, inside the engine compartment, it should spell out the gearing your truck was delivered with. Mine had 4:10 gearing which was an option for the getrag.

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post #9 of 10 (permalink) Old 12-08-2013, 01:25 PM
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Does it matter whether the 727 was 2wd or 4wd?
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post #10 of 10 (permalink) Old 12-08-2013, 03:21 PM
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You need to know if it is intercooled or non intercooled. 2wd or 4wd doesn't matter it went by auto or manual trans.

But a 20 year old truck could have had a gear swap sometime in it's lifetime so it's better to pull the cover off and check the teeth count.

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