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what would the best way short of removing the Diff cover to fine the gear ratio on my rear end.I jacked up the truck.And I turned the wheel and counted the drive shaft.And x2 that And come out with 3.25.Does that sound right?I dont know what some of the Ratios where for 1985 1/2 ton truck.
 

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well, i have an 85 3/4 ton and i have factory 3.54 gears. check if there is a tag on one of your cover bolts, it should say your ratio on it, you might have to scrape the rust and stuff off of it though.
shawn
 

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3.21 is a very common gear ratio...so, yes that sounds about right :)
 

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mine has the towing rear end 3.50, I read it on one of the stickers in the engine compartment and also on the original window sticker.
 

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1962vwbug said:
what would the best way short of removing the Diff cover to fine the gear ratio on my rear end.I jacked up the truck.And I turned the wheel and counted the drive shaft.And x2 that And come out with 3.25.Does that sound right?I dont know what some of the Ratios where for 1985 1/2 ton truck.
I thought 3.23 was common for Dodge.
 

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Yeah, 3.23 and 3.55 are the most common 1/2 ratios. There can be small differences in the gear ratios, but their still the same. Like 4.10 and 4.11 is effectively the same. That's why everyone's comming up with different numbers
 

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On my 84 front was 3.21, rear 3.23 (or maybe reversed)

On my 90 One was 3.54 the other 3.55.
 

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3.21 front 3.23 rear on a 83 ramcharger
 
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