Can anyone help, I have an 1985 blazer 4x4. it had an overdrive trans
in it with a np203 tranfer case and 3.08-1 gears. Now it has a t350
trans and np208 tranfer case. I have lifted it built the engine up with
more power. I am going to put 37 or 38 inch tires on it, all of the
charts say that i should put 5.28 or 5.71 gears in it for more power
over stock are they correct or is there a better way to find out what
should be in it. Can you help me. thanks

On 14 Jun 2005 19:51:00 -0700, h1humr@comcast.net wrote:

>Can anyone help, I have an 1985 blazer 4x4. it had an overdrive trans
>in it with a np203 tranfer case and 3.08-1 gears. Now it has a t350
>trans and np208 tranfer case. I have lifted it built the engine up with
>more power. I am going to put 37 or 38 inch tires on it, all of the
>charts say that i should put 5.28 or 5.71 gears in it for more power
>over stock are they correct or is there a better way to find out what
>should be in it. Can you help me. thanks

Your H1 has about a 5.40 ratio. With a diesel that might limit your
speed, but if it is gas you sould be ok in that range. Building and
engine is an open-ended statement: did you build for torque, high end
horsepower, or what? (basically what cam, and fuel system did you go
for: a mild cam with a smaller carb for torque, or a wilder cam with a
larger carb for high end power?

"h1humr" wrote:
>Can anyone help, I have an 1985 blazer 4x4. it had an overdrive trans
>in it with a np203 tranfer case and 3.08-1 gears. Now it has a t350
>trans and np208 tranfer case. I have lifted it built the engine up
>with
>more power. I am going to put 37 or 38 inch tires on it, all of the
>charts say that i should put 5.28 or 5.71 gears in it for more power
>over stock are they correct or is there a better way to find out what
>should be in it. Can you help me. thanks

Based on your current level of performance, a set of 4.88’s and 37’s
or 38’s would give you better performance now than with your current
set. You are going to be running into axle strength limitations with
37 or 38’s if you keep stock axles. Give all of this I would say 4.88
or maybe 5.13’s. I would strongly recommand that you find a 14 bolt
9.5 inch semifloating rear axle (not 10.5 full floater) for your
blazer as they came with 6 lug hubs to in some truck models and it is
about as strong as a Dana 60 but it is limited to a max ratio of 4.88
which would work for you anyway. Another nice thing about the 9.5 is
the wide selection of lockers avalible for it automatic and selectable
and even the stock posi unit is a lot stronger than one that comes in
a 10 bolt rear axle. It is a very wise upgrade for your truck since
you plan to run big rubber and the 9.5 will handle 38’s without any
problem too.

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"Peter D. Hipson" wrote:
>
>Your H1 has about a 5.40 ratio.
>

How did we get on a H1??

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Read his sig/email address again... <g>

On 15 Jun 2005 19:35:49 -0400, SnoMan <UseLinkToEmail@AutoForumz.com>
wrote:

>"Peter D. Hipson" wrote:
>>
>>Your H1 has about a 5.40 ratio.
>>
>
>How did we get on a H1??

"Peter D. Hipson" wrote:
>Read his sig/email address again... <g>
>
>On 15 Jun 2005 19:35:49 -0400, SnoMan
><UseLinkToEmail@AutoForumz.com>
>wrote:
>
>>"Peter D. Hipson" wrote:
>>>
>>>Your H1 has about a 5.40 ratio.
>>>
>>
>>How did we get on a H1??</font>

What has his "sig" got to do with it when he was clearly talking
about a 85 blazer????

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