Perez620 Posted May 30, 2018 Author Report Share Posted May 30, 2018 I don't think I answered that completely... 4 or 5 spd shouldn't matter but long or short tail will.... Also the Speedo assemblies are offset and centered depending on the gear.. So just be careful when you finally go to change that... Interesting. I'll have to do some research and see what I'm going to need for my setup. In the mean time I need to get my hands on a 5 spd 1 Quote Link to comment
Perez620 Posted May 30, 2018 Author Report Share Posted May 30, 2018 Mike, with my setup I'm going for.. L20B w/4.11 rear and future 5 spd.. Whats the real difference between the wide geared trans and a mid with my setup? I know earlier in the thread you made note of the difference between the actual change with a higher/lower ratio rear end. I'm just wondering as far as comfortable driving around town and highway cruising. I'm just wondering because I may have a '79 wide ratio 5 spd I could purchase but you mentioned it'd be best with a mid ratio most likely with my setup Also, what are the ratio's of a wide FS5W71B? You stated a mid-ratio is 3.321.. 2.077..1.308.. 1.000.. 0.864 and rev 3.382 so I already know those 1 Quote Link to comment
datzenmike Posted May 30, 2018 Report Share Posted May 30, 2018 I think the 4.11 is an 18 tooth pinion. The lower the tooth count the faster the speedo reads. As long as you unbolt and exchange the entire sleeve with the gear in it, you shouldn't have any problem swapping 4 to 5 or 5 to 5.... at least if the transmissions are '79 and older. Wide ratio has a 3.592 first... the other gears I'd have to look up tonight. All 4 and 5 speeds have the same 1 to 1 4th gear. HOW MANY TEETH ON YOUR PINION GEAR IN THE TRANSMISSION??? 2 Quote Link to comment
Perez620 Posted May 30, 2018 Author Report Share Posted May 30, 2018 I think the 4.11 is an 18 tooth pinion. The lower the tooth count the faster the speedo reads. As long as you unbolt and exchange the entire sleeve with the gear in it, you shouldn't have any problem swapping 4 to 5 or 5 to 5.... at least if the transmissions are '79 and older. Wide ratio has a 3.592 first... the other gears I'd have to look up tonight. All 4 and 5 speeds have the same 1 to 1 4th gear. HOW MANY TEETH ON YOUR PINION GEAR IN THE TRANSMISSION??? No idea. I currently don’t have a 5 speed but I’m searching for one. I do on the other hand have two four speeds now. Not sure on those either I’d have to check. I was just wondering, aside from the pinion gear subject, what ratio you would prefer with a L20B and a 4.11 rear? Wide or Mid. Wanna find what’s going to best suit the rear end 1 Quote Link to comment
datzenmike Posted May 30, 2018 Report Share Posted May 30, 2018 The '79 620 used a wide ratio and a 4.11 I see no problem with either. I have a car 4.11 with a mid ratio and love it. Truck might be slightly heavier so wide might be a good idea. If you decide to go lower like a 3.889 or 3.70 then a wide is even better. Your truck was an automatic and a four speed was put it??? Does the speedometer read correctly? I'm looking for a 22 tooth pinion. 2 Quote Link to comment
Charlie69 Posted May 30, 2018 Report Share Posted May 30, 2018 What color is the 22 tooth? 1 Quote Link to comment
Perez620 Posted May 30, 2018 Author Report Share Posted May 30, 2018 Great thanks for the info Mike. Yeah my truck originally had an auto w/L18. I bought the truck apart so now I’m rebuilding a L20B from a buddy and trying to find a 5 spd to pair up with the 4.11 I just bought So I don’t know if the speedometer was reading correctly since it wasn’t running 1 Quote Link to comment
datzenmike Posted May 31, 2018 Report Share Posted May 31, 2018 What color is the 22 tooth? Orange. Wide ratio 1st.... 3.592 2nd... 2.246 3rd... 1.415 4th... 1.000 5th.... 0.882 Mid ratio 1st.... 3.321 2nd... 2.077 3rd... 1.308 4th... 1.000 5th... 0.864 Close ratio 1st.... 3.062 2nd.. 1.858 3rd... 1.308 4th... 1.000 5th... 0.773 OR 0.745 1 Quote Link to comment
Perez620 Posted May 31, 2018 Author Report Share Posted May 31, 2018 Ran a few numbers on a GRC with 3 different rpm's just to give me an idea of a few cruising speeds. Figured I'd put them together and post them 5 speed transmission - wide vs mid ratio gear ratio’s calculated 4.11 rear end Tire Height - 25.5 WIDE 3000rpm 3500rpm 4000rpm Ratio MPH MPH MPH 3.592 15.42 17.99 20.55 2.246 24.65 28.76 32.87 1.415 39.13 45.66 52.18 1.00 55.37 64.6 73.83 .882 62.78 73.25 83.71 MID 3000rpm 3500rpm 4000rpm Ratio MPH MPH MPH 3.321 16.67 19.45 22.23 2.077 26.66 31.1 35.55 1.308 42.33 49.39 56.45 1.000 55.37 64.6 73.83 0.864 64.09 74.77 85.45 Quote Link to comment
Perez620 Posted May 31, 2018 Author Report Share Posted May 31, 2018 The '79 620 used a wide ratio and a 4.11 I see no problem with either. I have a car 4.11 with a mid ratio and love it. Truck might be slightly heavier so wide might be a good idea. If you decide to go lower like a 3.889 or 3.70 then a wide is even better. Your truck was an automatic and a four speed was put it??? Does the speedometer read correctly? I'm looking for a 22 tooth pinion. Btw just checked and both my 4 speeds have 20 teeth red speedo pinion gears. My 3 spd auto has 21 teeth violet 1 Quote Link to comment
Crashtd420 Posted May 31, 2018 Report Share Posted May 31, 2018 Btw just checked and both my 4 speeds have 20 teeth red speedo pinion gears. My 3 spd auto has 21 teeth violet Just out of curiosity how long are those speedo assemblies? 1 Quote Link to comment
Perez620 Posted May 31, 2018 Author Report Share Posted May 31, 2018 Pulled them both back out and both are 3” on the dot 1 Quote Link to comment
Crashtd420 Posted May 31, 2018 Report Share Posted May 31, 2018 That's what I thought you would say.... thanks.... 2 Quote Link to comment
Perez620 Posted May 31, 2018 Author Report Share Posted May 31, 2018 Received the 4.11 today and seems to be in decent shape. A few questions though for this future trans swap.. Original diff to the truck is a 4.625 and now have a 4.11 I will be installing. Will the driveshaft still mate up properly to the new 4.11? Looks like it will but figured I'd ask.. Also, since I originally had a 3 spd auto and going to a 5 speed, will I still be able to use the original driveshaft? 1 Quote Link to comment
datzenmike Posted May 31, 2018 Report Share Posted May 31, 2018 It should. The 3N71B and the 71B 4 and 5 speeds were the same length. 2 Quote Link to comment
Perez620 Posted May 31, 2018 Author Report Share Posted May 31, 2018 It should. The 3N71B and the 71B 4 and 5 speeds were the same length. Great! Thanks. Appreciate the help as always Now to find that speedo pinion 1 Quote Link to comment
Crashtd420 Posted June 1, 2018 Report Share Posted June 1, 2018 Great! Thanks. Appreciate the help as always Now to find that speedo pinion Wait on that till you swap things.. see how much your speedometer is off and adjust... you may already have what you need, you might need one tooth more or less from what might be suggested because of your tire choice even... 2 Quote Link to comment
Perez620 Posted June 1, 2018 Author Report Share Posted June 1, 2018 Wait on that till you swap things.. see how much your speedometer is off and adjust... you may already have what you need, you might need one tooth more or less from what might be suggested because of your tire choice even... Makes sense. Seems like this speedo pinion is a real issue across the 620’s. I’ve seen a few different things on Ratsun 1 Quote Link to comment
Crashtd420 Posted June 1, 2018 Report Share Posted June 1, 2018 Makes sense. Seems like this speedo pinion is a real issue across the 620’s. I’ve seen a few different things on RatsunAtleast you have the shorter Speedo assembly....Some of the info is a little confusing.. 2 Quote Link to comment
Charlie69 Posted June 1, 2018 Report Share Posted June 1, 2018 Orange. Wide ratio 1st.... 3.592 2nd... 2.246 3rd... 1.415 4th... 1.000 5th.... 0.882 Mid ratio 1st.... 3.321 2nd... 2.077 3rd... 1.308 4th... 1.000 5th... 0.864 Close ratio 1st.... 3.062 2nd.. 1.858 3rd... 1.308 4th... 1.000 5th... 0.773 OR 0.745 I do not have an orange one I have blue, red, and black I believe. 1 Quote Link to comment
datzenmike Posted June 1, 2018 Report Share Posted June 1, 2018 The only one I found was for a JDM Cedrick 1 Quote Link to comment
DanielC Posted June 1, 2018 Report Share Posted June 1, 2018 You need to choose a speedometer pinion based on the odometer reading. The odometer is mechanically connected to the rear wheels by gears, and a cable. Part of that geared mechanism turns a magnet, inside an aluminium cup. The aluminium cup is connected to the speedometer needle, and is spring loaded to return to zero. 1 Quote Link to comment
Charlie69 Posted June 2, 2018 Report Share Posted June 2, 2018 This is all I have the red ones I had 2 of them seam to have grown legs. The black bodied ones came out of 85/86 720s. [/url 1 Quote Link to comment
datzenmike Posted June 2, 2018 Report Share Posted June 2, 2018 The gray one is 21 tooth? 1 Quote Link to comment
Charlie69 Posted June 2, 2018 Report Share Posted June 2, 2018 I will get a count on it for you Mike. I do not remember what I pulled it out of. If you neeed one let me know. Quote Link to comment
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