nissan720 Posted September 25, 2016 Report Share Posted September 25, 2016 are the stock rear gears in a 1984 nissan 2wd 3.70.if changing to a 4.11 will there be a notable difference.would it be worth the time and effort performing the swap? 1 Quote Link to comment
G-Duax Posted September 25, 2016 Report Share Posted September 25, 2016 Depends on what you want to do with the truck, and what you have done to the engine. 1 Quote Link to comment
wayno Posted September 25, 2016 Report Share Posted September 25, 2016 are the stock rear gears in a 1984 nissan 2wd 3.70.if changing to a 4.11 will there be a notable difference.would it be worth the time and effort performing the swap? Yes there will be a difference, it will start out quicker, you will have to shift sooner, and if you were used to 3000rpms on the hiway with 370 gears, they will raise up to 3500/4000rpms with 411 gears, so if you don't like listening to your engine revved up high, stick with the 370 gears. Most folks on here would go from 411s to 370s on a 2wd, not the other way around, but if your hauling heavy loads around, the 411 gears will make it nicer to drive. 1 Quote Link to comment
datzenmike Posted September 25, 2016 Report Share Posted September 25, 2016 are the stock rear gears in a 1984 nissan 2wd 3.70.if changing to a 4.11 will there be a notable difference.would it be worth the time and effort performing the swap? Only the automatic 2wd had 3.70 gears. Five speeds were 3.545. Look on the engine tag on the passenger side inner fender just below the hood hinge. The differential ratio is stamped far bottom right HF35 is 3.545, HF37 is 3.7, HF38 is 3.889 and HF41 is 4.11 Using the stock tire size of 195/75R14 and in 5th gear on the highway. Gear ratio... 3.545........ 3.70......... 4.11 55MPH....... 2,088....... 2,179...... 2,421... RPMs 60MPH....... 2,278....... 2,378...... 2,641... RPMs 70MPH....... 2,658....... 2,774...... 3,081...RPMs Difference... yes indeed. Slightly poorer mileage, traded for better performance. In all gears and at all speeds the engine will be revved higher than with the stock installed differential gears. Speedometer will read higher than you are actually going. The 3.545 diff will have a 17 tooth speedometer drive in the transmission. Going from 3.545 to 4.11 is a 15.9% change so 17 up to 20 tooth is a 17.6% is as close as you will get. That's less that 1 MPH out at 50MPH. If you find a 4.11 in a truck grab the speedometer gear as well to go with it. 1 Quote Link to comment
Charlie69 Posted September 25, 2016 Report Share Posted September 25, 2016 I found a 4.11 gearset years ago in a 1980 720 king cab 2 wheel drive automatic. Quote Link to comment
datzenmike Posted September 25, 2016 Report Share Posted September 25, 2016 Charlie, I only get the '80 long bed 5 speed having 4.11 The KC was 3.889 but, shrug. The '81-'82 long bed automatics were 4.11 for sure. If you find a '79 620 with 4 or 5 speed... they came only with a 4.11. 1 Quote Link to comment
G-Duax Posted September 25, 2016 Report Share Posted September 25, 2016 listening to your engine revved up high Music to my old failing ears....... Mike, I think my 4.6 gears will put me almost at 3500 @ 70. Not run the numbers yet, 225x60-15 tires. Will an L16 (yeah, it really is, I would not lie - too much) with 11:1 compression, 290 cam, 40mm smooth bore bike carbs pull 7k & 140 on the freeway? 1 Quote Link to comment
nissan720 Posted September 25, 2016 Author Report Share Posted September 25, 2016 I found an 1982 king cab with 4:11 z22 engine.I am going to switch my rear end out for the 4:11.I have a 1984 with them z24 weber 32/36 carb custom magna flow exhaust and high flow cat.just want to make it a little quicker 1 Quote Link to comment
datzenmike Posted September 26, 2016 Report Share Posted September 26, 2016 Well it's not like a day and a half job and $250 to do this. You can easily unbolt the axles and pull them out enough to disengage the diff without removing the hydraulic brake lines, drop the bum out and pop the other in. They don't make the gasket anymore so get a good quality sealer like Permatex Blue (not the fucking blue RTV shit the chevy owners like to trowel on their intakes) You should be able to do this in a few hours. It will probably be an automatic. And the speedometer gears from it won't work in a standard. 1 Quote Link to comment
Rhino13 Posted September 27, 2016 Report Share Posted September 27, 2016 I highly recommend it if you don't do a lot of highway driving. I switched from 3.7 to 4.11 and its my favorite easy upgrade I've done. Its screaming in 5th when you get up around 80, but it'll still cruise 60 nicely. It just gets a bit uncomfortable at times, but the loudness of my exhaust and height of my truck really don't help that either haha 1 Quote Link to comment
nissan720 Posted September 30, 2016 Author Report Share Posted September 30, 2016 so the speedometer gear from the automatic will not work in the 5 speed?what do you do to get the correct mph?really like to do the swap without complications.can i just swap the complete rear end out of the 82 king cab into my 84 without any issues? 1 Quote Link to comment
datzenmike Posted September 30, 2016 Report Share Posted September 30, 2016 You can compare but I'm pretty sure they are different diameter holes for the sleeve to fit into. How many teeth are on the auto sleeve? 1 Quote Link to comment
nissan720 Posted September 30, 2016 Author Report Share Posted September 30, 2016 dont know yet .have not pulled it out yet 1 Quote Link to comment
datzenmike Posted September 30, 2016 Report Share Posted September 30, 2016 All you need is a matching number tooth pinion sleeve for the 5 speed. You may still be able to buy it fromNissan 1 Quote Link to comment
nissan720 Posted October 1, 2016 Author Report Share Posted October 1, 2016 Went to local parts yard today. They want 300.00 for the complete rear end that's a little expensive for.me.there just going to crush the truck anyway 1 Quote Link to comment
datzenmike Posted October 1, 2016 Report Share Posted October 1, 2016 You don't want or need the whole thing (for that you should get the entire truck) so tell them you'll remove the third member yourself and offer them $50 and leave your number. Get a name. If they don't call call back in a week call back and ask for J. Doe.... and offer him $40. 1 Quote Link to comment
nissan720 Posted October 1, 2016 Author Report Share Posted October 1, 2016 yes sir you are right i will go back tomorrow and do just that.will keep all posted. 1 Quote Link to comment
datzenmike Posted October 1, 2016 Report Share Posted October 1, 2016 Do not pay more than $50 to those fucks. Phone them, it's cheaper. 1 Quote Link to comment
nissan720 Posted October 1, 2016 Author Report Share Posted October 1, 2016 ok thanks for the advice.i will do that. i will let you know how things turn out. 1 Quote Link to comment
nissan720 Posted October 1, 2016 Author Report Share Posted October 1, 2016 you were right datzenmike called them on the phone got the whole thong for 100.00 they pulled it out 1 Quote Link to comment
datzenmike Posted October 1, 2016 Report Share Posted October 1, 2016 $100 is an ok price. Didn't want to suggest anything over $50 because they were dicks for saying $300. Are you getting the ratio you want? Checked the engine tag? The ratio is also stamped on the outside edge of the crown gear. Example 35:8 is 35 divide by 8 = 4.375 37:8=4.625 37:9=4.11 35:9=3.889 37:10=3.7 1 Quote Link to comment
nissan720 Posted October 2, 2016 Author Report Share Posted October 2, 2016 its a 4:11 according to the tag on the inner fender under the hood .truck is an 1982 king cab with a z22 engine 1 Quote Link to comment
wayno Posted October 2, 2016 Report Share Posted October 2, 2016 The 84 rearend you have might be a better rearend than the 82, as the 84 might have automatic brake adjustment, I would keep that and just change out the pumpkin. 1 Quote Link to comment
nissan720 Posted October 2, 2016 Author Report Share Posted October 2, 2016 ok thanks for the info. 1 Quote Link to comment
nissan720 Posted October 4, 2016 Author Report Share Posted October 4, 2016 are the axles the same diameter on the 82 and the 84.if i can just change the pumpkin that would be great. 1 Quote Link to comment
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