98-02 4spd tranny rpms

[bozncsurf]

im in the market for a 2nd 100 and due to budget I'm mostly finding older LC's with the 4spd tranny. I do a lot of highway driving.

I understand that the 03-up have a 5spd tranny and therefore different shifting points or bands as well as different gear ratio's.

I would like to get an idea of high speed rpm's

My 05 runs about 2k rpm's at a speed of 65 mph with 34.5 tires.

If I were to shift over to 4th gear to mimic a 4spd trans the rpm's shoot up an extra 1k.

May be a bad question but since I haven't driven an older model in years- What can I expect for rpm's at the following mph 55? 60? 65? 70? 75?

Thanks for your time and help

 

[Ramathorn15]

I may be wrong but I think the final gear ratio is the same, if not very close, in the 5 and 4 speeds. Putting yours in 4th gear would not be similar to only having the 4 speed.

 

[Bardiya]

My 100 series has the A442F and a completely different engine but at 62mph I'm at 2000rpm, the A434F and A442F have similar gear ratios;

A442F
1st 2.950:1
2nd 1.530:1
3rd 1.000:1
OD .765:1
R 2.678:1

A343F
1st 2.804:1
2nd 1.531:1
3rd 1.000:1
OD .753:1
R 2.393:1

Hijacked from Gear ratios, A redux

 

[bozncsurf]

Thanks for clearing that up guys .. Honestly I was talking about differential gear ratios 4.10 vs 4.30

 

[DJCloz]

in my 99, with stock gears, 305's (33.4'' tall tire) I am running at about 2600 rpms @ 70 MPH on the speedo which is about 74 MPH on the GPS......... I'm 92% sure my stock gears are 4.3....

 

[ihadmail]

You can't directly compare the 4.10 vs the 4.30 because the individual gears in the 4sp vs 5sp are different.

With 33" tires 275/60r20 I am running approximately 2300rpm at a gps confirmed 70mph.

 

[camino70]

Calculating Differential Gear Ratio Changes

 

[reznunt]

98 LC
Stock 4.30 gears
315-75-16 BFG AT KO2's
Speedo calibrated (yellowbox)

60 MPH = 1900 RPM
65 MPH = 2000 RPM
70 MPH = 2200 RPM
75 MPH = 2400 RPM