what should be my rpm at 65

[X-North]

Ok you dont seem to be lucky...for me it worked.For engine additive i dont know but what the hell anyway my engine only leak small drops from oil pan gasket so ill let it go like that

 

[Tethy]

I had really high and loud rpms for awhile then on day I saw a vacuum hose that wasnt connected. Once I re-attached it the rpms dropped and the truck got quite agin. It was on the driver side attached to the black orb looking gizmo. such technical terms I know.

 

[chetzar]

92 i sit at about 3k rms at 70, in D, i dont use OD much as i do alot of in town driving and some country driving.
I have noticed that in the past when i did use OD on the interstate i was at about 2700, i'll throw the sexy exy in OD on the way home from skewl wed ( i can take the interstate instead of going through town) and see what it does.

 

[X-North]

Black org....you mean a plastic black ball ??? It is he EGR vacuum canister

 

[X-North]

Theres a lot of you having first gen explorer that seems to have higher rpm than me....i am curious to know what is the ratio of your differential? Dont forget the guy who started the thread had an automatic transmission A4LD so dont try tp compare manual trany or other generations explorer to it. I have a A4LD with 3.27 rear diff and at 65 mph on the highway i wind it at 2000 rpm on D and 1600 RPM on OD

 

[chetzar]

I have n uato A4LD trans, but I couldnt tell ya what gear ratio, other than its most likely stock...unless the person i bought it from changed it.

 

[91exploreron37]

Black org....you mean a plastic black ball ??? It is he EGR vacuum canister

Actually thats the evap purge canister A.K.A charcoal canister. It takes the excess vapors from the fuel tank and slowly releases it back into the intake rather than venting it into the atmosphere. The EGR valve recirculates exhaust back into the engine to reduce emissions.

 

[91exploreron37]

Check the sticker on the drivers door panel and compare it with this chart to figure out what gear ratio you have.
http://www.therangerstation.com/tech_library/Axles.html

Also maybe the trans is slipping which is causing the higher rpms compared to yours X-North I'm not a transmission tech so dont take my word for it. They probably have high mileage and are just worn out.

 

[chetzar]

I did 65 on the highway today and was chillin at 3100ish in OD, compared to 2900-3k at 65-70 in D, but my trans is old, tbh i think it might be the one that came out of the factory on it, and my car has 192k miles. My tranny does slip if i accelerate hard.

 

[92greenexplorer]

it is a 327 gear ratio

 

[92greenexplorer]

would that make my rpm high

 

[92greenexplorer]

MPH x Gear Ratio x 336
RPM = ―――――――――――――
Tire Size
does this work

 

[92greenexplorer]

To sum it all up it can be handy to use this table. It is based on the above formula. You can use it to quickly estimate your trucks best gear ratio.

Tire Gear Ratio

Size 3,31 3,42 3,55 3,73 3,91 4,11 4,27 4,56 4,88 5,13 5,29 5,38 5,71 6,17 7,17
30 2410 2490 2584 2715 2846 2992 3109 3320 3553 3735 3851 3917 4157 4492 5220
31 2332 2409 2501 2628 2755 2896 3008 3213 3438 3614 3727 3790 4023 4347 5051
32 2259 2334 2423 2546 2669 2805 2914 3112 3331 3501 3610 3672 3897 4211 4894
33 2191 2263 2349 2469 2588 2720 2826 3018 3230 3395 3501 3561 3779 4083 4745
34 2126 2197 2280 2396 2512 2640 2743 2929 3135 3295 3398 3456 3668 3963 4606
35 2065 2134 2215 2328 2440 2565 2664 2845 3045 3201 3301 3357 3563 3850 4474
36 2008 2075 2154 2263 2372 2493 2590 2766 2961 3112 3209 3264 3464 3743 4350
37 1954 2019 2095 2202 2308 2426 2520 2692 2881 3028 3123 3176 3370 3642 4232
38 1902 1966 2040 2144 2247 2362 2454 2621 2805 2948 3040 3092 3282 3546 4121
39 1854 1915 1988 2089 2190 2302 2391 2554 2733 2873 2962 3013 3198 3455 4015
40 1807 1867 1938 2037 2135 2244 2331 2490 2664 2801 2888 2937 3118 3369 3915
44 1643 1698 1762 1851 1941 2040 2119 2263 2422 2545 2626 2670 2834 3063 3559

 

[X-North]

This table is not useful because 235/75R15 give 29 inches and some diff ratio are lower than 3.31 and anyway it also depends on the gears of the tranny. My tranny is working almost like new so compare it to mine I have A4LD tranny with 1354 electrical transfer case and 3.27 diff. I have 1600 rpm on 62 mph so compare it to mine. Theres a lot of things to verify for the tranny ..if its not the fluid it may be band ajustemet, vacuum diaphram, etc it take a lot of vacuum tools and knowledge. Take ti to a transmission store or change this transmission.

 

[X-North]

MPH x Gear Ratio x 336
RPM = ―――――――――――――
Tire Size
does this work

This dont even work calculate correctly man it give me over 62000 rpm hahaha

 

[92greenexplorer]

sounds god thanks

 

[91exploreron37]

This table is not useful because 235/75R15 give 29 inches and some diff ratio are lower than 3.31 and anyway it also depends on the gears of the tranny. My tranny is working almost like new so compare it to mine I have A4LD tranny with 1354 electrical transfer case and 3.27 diff. I have 1600 rpm on 62 mph so compare it to mine. Theres a lot of things to verify for the tranny ..if its not the fluid it may be band ajustemet, vacuum diaphram, etc it take a lot of vacuum tools and knowledge. Take ti to a transmission store or change this transmission.

This charts better.
http://www.therangerstation.com/tech_library/gearandtirechart.html

 

[X-North]

Yes this one is better and you have to take off 30% from those numbers for your overdrive