rome11six Posted October 3, 2012 Report Share Posted October 3, 2012 ok so iv searched and havent found a answer.... i have 4.6 rear end gears and i want to swap to 3.89 out of the 720 but can this handle 300tq. if not what can with little to no modification? Quote Link to comment
kelowg Posted October 3, 2012 Report Share Posted October 3, 2012 What motor do u have in it? Stock rear handle about that much torque. Might need to go with ford 9" Quote Link to comment
datzenmike Posted October 3, 2012 Report Share Posted October 3, 2012 The H-190 is good for just under 300 ft pounds of torque. You have an '82-'83 automatic ??? Quote Link to comment
]2eDeYe Posted October 3, 2012 Report Share Posted October 3, 2012 He has a KA24DE 620. Quote Link to comment
datzenmike Posted October 3, 2012 Report Share Posted October 3, 2012 The early 620 automatics came with 4.625 diffs. Figured it might be one. I don't think the DE only makes half of 300 ft pound of torque so it's safe. Quote Link to comment
rome11six Posted October 3, 2012 Author Report Share Posted October 3, 2012 i was thinking a ford 9" but didnt know how hard it was to put in and ya i have a ka24de in it now witch maybe puts down 160-180tq on a good day but im going in a different direction at the end of the month cause im still not happy with the power. the motor i have for it stock has 180hp and 230tq with a couple easy mods (that i will do latter down the road) and bolts on's it will make 230hp and 300tq. so i dont know if a stock third member swap will work. Quote Link to comment
Z-train Posted October 3, 2012 Report Share Posted October 3, 2012 And just what are you" bolting on" that will give you almost a 100% torque increase? Quote Link to comment
Farmer Joe Posted October 3, 2012 Report Share Posted October 3, 2012 i dont ge where your getting 300ftlbs of toque from a KA unless its a full turbo build or somethin... in any case, if your going for more power, then with a datsun you dont have anything that just bolts in.. figure it out man.. 1 Quote Link to comment
rome11six Posted October 4, 2012 Author Report Share Posted October 4, 2012 uhhhh ok fine i got a g54bt that im puting in and im going to build it over time. i have a friend with three extra so why not right with 190hp and 230tq from the factory! :D so for what im doing is the ford 9" the best route? anything easier? if so any build threads with a 9" install? Thanks! Quote Link to comment
jesusno2 Posted October 4, 2012 Report Share Posted October 4, 2012 toyota 8 inch will handle it factory 4.10 gear with lsd avaliable in many forms already 6 lug also. Quote Link to comment
datzenmike Posted October 4, 2012 Report Share Posted October 4, 2012 Shorten a D21 or Pathfinder. 4.375 or 6.625 both with LSD and they are larger than a Ford 9". Quote Link to comment
rome11six Posted October 4, 2012 Author Report Share Posted October 4, 2012 toyota 8 inch will handle it factory 4.10 gear with lsd avaliable in many forms already 6 lug also. yes defiantly wanna stay 6 lug since i just bought rims for it and how hard or easy is it to fit in? Quote Link to comment
rome11six Posted October 4, 2012 Author Report Share Posted October 4, 2012 Shorten a D21 or Pathfinder. 4.375 or 6.625 both with LSD and they are larger than a Ford 9". will the d21 swap right over? Quote Link to comment
]2eDeYe Posted October 4, 2012 Report Share Posted October 4, 2012 Both the D21 and the Toyota axle will be wider than the 620 axle. Quote Link to comment
jesusno2 Posted October 4, 2012 Report Share Posted October 4, 2012 i narrow yota diffs for datsun applications Quote Link to comment
datzenmike Posted October 4, 2012 Report Share Posted October 4, 2012 Shorten a D21 or Pathfinder. 4.375 or 6.625 both with LSD and they are larger than a Ford 9". will the d21 swap right over? Well I did say shorten.... I seem to remember measuring my WD-21 (Pathfinder) and it was 160cm or 63" WMS wheel mounting surface to WMS. The 620 is like 58 or so? Quote Link to comment
rome11six Posted October 4, 2012 Author Report Share Posted October 4, 2012 ok next question is how to tell the diff ratio in a d21 cause the local u pull it has two hardbody d21's in it and im prob just going to pull one of them! Quote Link to comment
wayno Posted October 5, 2012 Report Share Posted October 5, 2012 Are you drifting or drag racing this vehicle? Eric is drag racing his 521 with a welded up H190 rearend, he is almost getting 90mph in the quarter, I have not heard of him blowing up any of his rearends, granted I don't know what kind of torque numbers he is putting into the rearend, but he isn't nice to his rig slamming it like that out of the hole. The H190 is a strong rearend, I would go with it till you know it won't work for you. Quote Link to comment
EricJB Posted October 5, 2012 Report Share Posted October 5, 2012 Unless your running slicks and slapper bars, or are going to ladder bar or 4link, the tires will let go before the diff does. Next in line is the driveshaft or trans. Mine is ladder bar, with 8 inch hoosiers at 12 psi. I leave with the pedal matted at 7k and dump it. 50 plus passes. No problem so far Here ya go. http://www.youtube.com/watch?v=nc2dXjZvPRQ&feature=g-upl 1 Quote Link to comment
datzenmike Posted October 5, 2012 Report Share Posted October 5, 2012 ok next question is how to tell the diff ratio in a d21 cause the local u pull it has two hardbody d21's in it and im prob just going to pull one of them! Look on the pass side inner fender just under the hood hinge. The engine tag has that inso on the lower right side... Bottom TRANS/AXLE FS5W71C HF35 The HF35 is a 3.545 ratio. A 41 is 4.11, a 43 is 4.375 and so on. . Quote Link to comment
rome11six Posted October 7, 2012 Author Report Share Posted October 7, 2012 Are you drifting or drag racing this vehicle? Eric is drag racing his 521 with a welded up H190 rearend, he is almost getting 90mph in the quarter, I have not heard of him blowing up any of his rearends, granted I don't know what kind of torque numbers he is putting into the rearend, but he isn't nice to his rig slamming it like that out of the hole. The H190 is a strong rearend, I would go with it till you know it won't work for you. I am going to be daily driving it and towing a small trailer and moving parts all the time so i dont wanna weld the diff but i would like a lsd Unless your running slicks and slapper bars, or are going to ladder bar or 4link, the tires will let go before the diff does. Next in line is the driveshaft or trans. Mine is ladder bar, with 8 inch hoosiers at 12 psi. I leave with the pedal matted at 7k and dump it. 50 plus passes. No problem so far Here ya go. Nice how much power do you have? Look on the pass side inner fender just under the hood hinge. The engine tag has that inso on the lower right side... Bottom TRANS/AXLE FS5W71C HF35 The HF35 is a 3.545 ratio. A 41 is 4.11, a 43 is 4.375 and so on. . Thats what i though didnt know if it was the same on the d21 as the 720's and 620's thanks! Quote Link to comment
EricJB Posted October 7, 2012 Report Share Posted October 7, 2012 Nice how much power do you have? I have no idea what the actual #'s are. Not much though. It's an LZ2.3 cast pistons u67 head w/ z intake valves, crane springs, Delta 490/290 cam 40 DCOE's S and S shorty header (piece of crap) It's getting a whole new top end right now. Quote Link to comment
datzenmike Posted October 7, 2012 Report Share Posted October 7, 2012 Similar 2.3s were just over 130 RWHP. Quote Link to comment
rome11six Posted October 9, 2012 Author Report Share Posted October 9, 2012 I have no idea what the actual #'s are. Not much though. It's an LZ2.3 cast pistons u67 head w/ z intake valves, crane springs, Delta 490/290 cam 40 DCOE's S and S shorty header (piece of crap) It's getting a whole new top end right now. i really wanted to build a l20 and keep carbs in the truck but i couldn't get the power i wanted so.... Quote Link to comment
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