for guys with 31"s

Justin · Post by **Justin** » Mon Mar 17, 2003 5:50 am

Do you find that your truck shifts from 1900rpm to 2500rpm when driving uphill on the highway. I can't keep 70mph going uphill without it downshifting and cranking up to 2500-3000

sometimes...is this ok??

seapahn · Post by **seapahn** » Mon Mar 17, 2003 11:54 am

On my ZR2 with the 3.73 gears, I am usually around 3000 RPM going up hill ... but man does the blazer want to fly at that RPM!!!!

I usually take it out of OD to save the tranny when going up hill ... otherwise it's trying to stay around 2000RPM so keeps shifting in and out. But when I put it on 3, at around 70 MPH I do 3000 rpm.

a2b · Post by **a2b** » Mon Mar 17, 2003 2:58 pm

yes that is normal. your heavier and bigger tires are slowing you down now. so unless you re gear, thats the way it will be. going up most hills i put it in 3rd and go 55 or 60

quickbiker · Post by **quickbiker** » Mon Mar 17, 2003 5:15 pm

Yea, that's one of the things I figure is eating up my gas mileage. The way I figure with multiple different formulas I find on the web, with 4.11 gears and 31's would bring me just a notch lower than 3.73's and stock 29's. It was just perfect when I was stock 29's, never downshifted much. Cant be that good on the tranny either, probably cause a bit more wear.

Warnoffroad · Post by **Warnoffroad** » Mon Mar 17, 2003 7:54 pm

I have a hard time getting up over 70, is something wrong?

quickbiker · Post by **quickbiker** » Mon Mar 17, 2003 7:58 pm

Wowzers, yea, I'd say some'm wrong. I really don't know my top speed, probably way to fast to be safe. 70 is nothing for my truck, plenty pep there. Prob do well over 100 I would imagine.

What you do to your engine now?

Brad · Post by **Brad** » Mon Mar 17, 2003 8:19 pm

Saw 90 the other day. No prob.

Brad

Post by **HenryJ** » Mon Mar 17, 2003 8:42 pm

Without reprogramming the top speed limiter you won't get past 93 mph.

I set mine with the HPPIII to 110. I'll probably never take it there, but I've hit 85 or so on station responses for general alarms

AZS10Crew · Post by **AZS10Crew** » Mon Mar 17, 2003 9:40 pm

I drive 80-85 every day on the way to and from work. Have to to keep up with traffic.

Well...not the whole way...but at least halfway I've got the cruise set on 80.

a2b · Post by **a2b** » Tue Mar 18, 2003 1:43 am

AZS10Crew wrote:I drive 80-85 every day on the way to and from work. Have to to keep up with traffic.

Well...not the whole way...but at least halfway I've got the cruise set on 80.

dude, i know. whats up with pheonix traffic. everybody like goes 90 on the way to work. if you go the speed limit, you get ran over!

quickbiker · Post by **quickbiker** » Tue Mar 18, 2003 3:58 am

HenryJ wrote:Without reprogramming the top speed limiter you won't get past 93 mph.

I set mine with the HPPIII to 110. I'll probably never take it there, but I've hit 85 or so on station responses for general alarms

Well, I know I did 110 easy when I was stock. But can't be much accurate when it is going that fast.

AZS10Crew · Post by **AZS10Crew** » Tue Mar 18, 2003 8:52 am

a2b wrote:dude, i know. whats up with pheonix traffic. everybody like goes 90 on the way to work. if you go the speed limit, you get ran over!

We all love our jobs so much we just want to get to work as quickly as possible I guess.

Warnoffroad · Post by **Warnoffroad** » Tue Mar 18, 2003 10:03 am

It will go over, but it seems to have a hard time getting there. Nothing like going from 0-40.

Justin · Post by **Justin** » Tue Mar 18, 2003 7:29 pm

is it more of a gear change or a hp increase to keep her in 4th going uphill on the highway? Will more hp just keep her at 70 or will she keep downshifting into 3rd? If more hp is the case, roughly how much hp will i need?

quickbiker · Post by **quickbiker** » Tue Mar 18, 2003 7:36 pm

4.11 gears and you be set. Some nice high lift short duration cams would give you some nice low rmp grunt also. But which is worth it. I think gears would get you more.

Post by **HenryJ** » Tue Mar 18, 2003 9:33 pm

Have you guys with the stuttering shift problem added a shift firmness enhancement?

The only times I have "HAD" to shift to third is for "Three Mile Hill" and "Cabbage Hill" they are both around 6% grade , I just did it to be easier on the trans, and wasn't pushing it.

I've not had the problem you guys describe, but I do have small 31's, HPIII 87 octane tuning, lowered the shift points for 2-3 and 3-4 and the shift firmness.

Just wondering if maybe the HPPIII might be a solution.

IMO, the gears would be a good investment. I'd like to be back to the stock final drive ratio. BUT, It is a pretty big investment.

quickbiker · Post by **quickbiker** » Wed Mar 19, 2003 9:54 pm

Mine shifts very solid. My previous truck, 93 Dakota Sport 4x4 shuttered like crazy shifting from 2nd to 3rd up hills, going back and forth. Is that what you mean by shuddering?

TNC · Post by **TNC** » Wed Mar 19, 2003 10:58 pm

a2b wrote:
AZS10Crew wrote:I drive 80-85 every day on the way to and from work. Have to to keep up with traffic.

Well...not the whole way...but at least halfway I've got the cruise set on 80.

dude, i know. whats up with pheonix traffic. everybody like goes 90 on the way to work. if you go the speed limit, you get ran over!

Only 85 you must get passed like your sitting still...

a2b · Post by **a2b** » Thu Mar 20, 2003 8:21 pm

TNC wrote:
a2b wrote:
AZS10Crew wrote:I drive 80-85 every day on the way to and from work. Have to to keep up with traffic.

Well...not the whole way...but at least halfway I've got the cruise set on 80.

dude, i know. whats up with pheonix traffic. everybody like goes 90 on the way to work. if you go the speed limit, you get ran over!

Only 85 you must get passed like your sitting still...

hey TNC, glad to have you on the site. i saw a blue and maroon crew last weekend? could it of been you?

TNC · Post by **TNC** » Thu Mar 20, 2003 10:51 pm

Nope wasn't me... Mine CC is White and in the Shop

... But I see other CC's all the time, haven't seen a blue one yet, or one with a lift...