datzenmike Posted February 22, 2019 Report Share Posted February 22, 2019 It is strange but the first few months the 4x4s did come with 3.889s I think build dates of Jan through June '83 Although the Z24 was offered in Nov. in 2wd the 4x4 lagged behind slightly. July '83 on are 4.11 1 Quote Link to comment
Patthedog Posted March 4, 2019 Report Share Posted March 4, 2019 Update on this the tag on my fender said 3:88 when I busted my rear end apart it was 3:56.9 or something close to that . So looks like someone had this issue years ago on this truck and just forgot to mention it when I bought it lol . I wasn’t able to find a 3:88 rear end but did find a 3:77.10 in the local pull a part in a 84 2 wheel drive 720 and I changed the small input shaft to my larger input shaft and it bolted right in no issues no drama . I can’t use my 4x4 function because chances are I’m still a 3:88 in front and have a feeling the few times I used it the ratio difference between the front and the rear is what caused my differential to go out . Now I know I have a mismatched set I won’t make that mistake again . 1 Quote Link to comment
Stoffregen Motorsports Posted March 4, 2019 Report Share Posted March 4, 2019 Changed the input shaft? Do you mean flange? I hope so. Yes, having mis-matched R&P gears front to rear can cause problems. 1 Quote Link to comment
Patthedog Posted March 4, 2019 Report Share Posted March 4, 2019 1 hour ago, Stoffregen Motorsports said: Changed the input shaft? Do you mean flange? I hope so. Yes, having mis-matched R&P gears front to rear can cause problems. The piece held in by the big nut on the pinion that you tourqe down the 2 wheel drive one was a smaller diameter than the one on my 83 . I’m slowly getting a education on this truck and this site as well some super cool knowledgeable people here and years of experience with these little trucks . 2 Quote Link to comment
datzenmike Posted March 4, 2019 Report Share Posted March 4, 2019 YUP. Around '82 the 2wd and 4wd flange splines changed. They used to be the same but then the 4x4'xs got larger. Found this out the hard way part way through a swap. 1 Quote Link to comment
Stoffregen Motorsports Posted March 6, 2019 Report Share Posted March 6, 2019 On 3/4/2019 at 9:11 AM, Patthedog said: The piece held in by the big nut on the pinion that you tourqe down the 2 wheel drive one was a smaller diameter than the one on my 83 . I’m slowly getting a education on this truck and this site as well some super cool knowledgeable people here and years of experience with these little trucks . No worries. I was just double checking. It can be a steep learning curve, but keep at it. Nothing beats experience. 1 Quote Link to comment
Charlie69 Posted March 6, 2019 Report Share Posted March 6, 2019 (edited) On 3/4/2019 at 1:16 PM, datzenmike said: YUP. Around '82 the 2wd and 4wd flange splines changed. They used to be the same but then the 4x4'xs got larger. Found this out the hard way part way through a swap. Mike is this when Nissan started using the C200 diff instead of the H190? Edited March 6, 2019 by Charlie69 Quote Link to comment
datzenmike Posted March 6, 2019 Report Share Posted March 6, 2019 Not that I know of. I grabbed a 4x4 diff and put it in then realized the driveshaft would not fit. I pulled both flanges out to swap them and .... they were different. WTF Nissan??????? The C-200 was used with the Z24 (4x4) or after Oct '83? This was an '82? 4x4 I think. The newer driveshaft was larger diameter....IIRC 1 Quote Link to comment
Patthedog Posted March 6, 2019 Report Share Posted March 6, 2019 1 hour ago, datzenmike said: Not that I know of. I grabbed a 4x4 diff and put it in then realized the driveshaft would not fit. I pulled both flanges out to swap them and .... they were different. WTF Nissan??????? The C-200 was used with the Z24 (4x4) or after Oct '83? This was an '82? 4x4 I think. The newer driveshaft was larger diameter....IIRC In my case and maybe it’s possible it was a fluke but my truck is a early 83 made in Japan 4x4 with the large yoke driveline and or flange . The truck I found my rear end replacement in was a early 84 2wd when they first started making them in Tennessee. Perhaps it’s possible the rear end used in that 84 2wd was the same pinion as used in the 2 and 4x4 trucks made in Japan maybe the splines didn’t change till late 84 in the 2wd? But all I know is I took that small flange off and my larger diameter flange and yoke went right on tooth for tooth torqued it down and I’ve got 200 miles on it already . And who knows maybe the rear end in my donor truck had been replaced at one point because the tolerances on that thing was outrageous for being 30 years old and 250,000 miles as indicated on the truck itself 1 Quote Link to comment
datzenmike Posted March 6, 2019 Report Share Posted March 6, 2019 All 2wd are H-190. All 4wd to Oct '83 are H-190 and changed to C-200 Some when before Oct '83 the 4wd H-190 changed the differential yoke to a different spline. If anyone knows when the driveshaft increased in diameter... that would probably be then also. Like I said I had a serious problem. I ended up cutting and grinding the spline part off and welding it to the other... kind of piggy backed. It was fucked but had no choice... worked fine. 1 Quote Link to comment
Stoffregen Motorsports Posted March 6, 2019 Report Share Posted March 6, 2019 Driveshaft diameters tend to increase with added length. If you compare a short cab short bed shaft with a long bed extra cab shaft, it's likely the latter is larger diameter. Not saying I know anything about 720 driveshafts. 1 Quote Link to comment
Patthedog Posted January 28, 2020 Report Share Posted January 28, 2020 I have a 5/83 Nissan 720 it has the H190 rear diff with 3.889 gears we recently came across a gutted 85 Nissan 720 with a C200 with 4:11 gears front and back is it a direct swap taking out a H190 for the c200 ? Or are there hidden issues that changed between the trucks 1 Quote Link to comment
Stoffregen Motorsports Posted January 28, 2020 Report Share Posted January 28, 2020 Nothing is ever a direct swap. 2 Quote Link to comment
datzenmike Posted January 28, 2020 Report Share Posted January 28, 2020 The C-200 driveshaft pinion flange is likely larger. 1 Quote Link to comment
Stoffregen Motorsports Posted January 28, 2020 Report Share Posted January 28, 2020 Have you had a good visual inspection of the C200? Have you compared it to your H190? I am not an expert on later model Datsun/ Nissan trucks, but over the years I have developed a list of things to check. - overall width (WMS to WMS) - distance between spring perch centers - spring perch location (over or under axle) - pinion angle ( compared at the spring perch) - brake line routing - parking brake cable routing/location/type - flange type and bolt pattern - brackets (LSV, cables, brake lines, hoses, etc) Someone here has to know if this is a direct swap, but if you don't get any answers, you're going to need to check these things for yourself. 1 Quote Link to comment
wayno Posted January 28, 2020 Report Share Posted January 28, 2020 (edited) This post I made had the wrong info so I deleted it. Pinion flanges on the H190 gearsets/drop outs are interchangeable, big pattern or small pattern doesn't matter, but they do not interchange with the C200, the pinion shafts are different sizes. Edited January 28, 2020 by wayno 1 Quote Link to comment
Patthedog Posted January 28, 2020 Report Share Posted January 28, 2020 (edited) 3 hours ago, wayno said: Edited January 28, 2020 by Patthedog Incorrect info 1 Quote Link to comment
Patthedog Posted January 28, 2020 Report Share Posted January 28, 2020 1 hour ago, Stoffregen Motorsports said: Have you had a good visual inspection of the C200? Have you compared it to your H190? I am not an expert on later model Datsun/ Nissan trucks, but over the years I have developed a list of things to check. - overall width (WMS to WMS) - distance between spring perch centers - spring perch location (over or under axle) - pinion angle ( compared at the spring perch) - brake line routing - parking brake cable routing/location/type - flange type and bolt pattern - brackets (LSV, cables, brake lines, hoses, etc) Someone here has to know if this is a direct swap, but if you don't get any answers, you're going to need to check these things for yourself. They are side by side in the garage so this is doable just was curious if someone had done it before but your logic absolutely rock solid 2 Quote Link to comment
wayno Posted January 28, 2020 Report Share Posted January 28, 2020 (edited) I mentioned I was fuzzy on this subject, just to make sure I was right I went out and removed a pinion flange from the C200 dually axle I have and it turns out they are not the same, the shafts are different sizes and that large pinion flange I have likely came off that 1993 H190 LSD I found years ago. I am going to delete what I wrote as it is wrong. the H190 pinion flange will not fit my C200 dually axle, could you edit your post you quoted me in as the info is wrong when it comes to a C200. Edited January 28, 2020 by wayno 2 Quote Link to comment
Madkaw Posted January 30, 2020 Report Share Posted January 30, 2020 On 2/22/2019 at 8:50 AM, datzenmike said: It is strange but the first few months the 4x4s did come with 3.889s I think build dates of Jan through June '83 Although the Z24 was offered in Nov. in 2wd the 4x4 lagged behind slightly. July '83 on are 4.11 I’ll throw in my 2 cents . My 5/83 4WD has the 3.889 gears - which I like . I cannot say much to driveshafts , but I do know the front driveshaft i took off an 85 I had to change flanges , the rear driveshaft I did not . I ordered flanges for the Z car driveshafts that matched the yokes to fix the front DS. 1 Quote Link to comment
datzenmike Posted January 30, 2020 Report Share Posted January 30, 2020 The impression I got from my info was the beginning of the '83 model year (July or Aug) till 11'83 when the Z24 was introduced, and many other changes. Maybe also through the rest of the year then? 3.889 is a tall gear for a 4x4... is this a short wheelbase truck? 1 Quote Link to comment
Madkaw Posted January 30, 2020 Report Share Posted January 30, 2020 1 hour ago, datzenmike said: The impression I got from my info was the beginning of the '83 model year (July or Aug) till 11'83 when the Z24 was introduced, and many other changes. Maybe also through the rest of the year then? 3.889 is a tall gear for a 4x4... is this a short wheelbase truck? If your referring to me - it’s a standard cab . I’m not an off roader type , so for me it’s the idea of having 4wd as an option, not a necessity . Don’t plan on running 31’s , so the truck is peppy enough with the right tune even with 3.9 gears . With 4 low gearing available , I would think I could do anything I would want . 1 Quote Link to comment
datzenmike Posted January 30, 2020 Report Share Posted January 30, 2020 Standard cab short wheelbase would be lighter. Low range is 2 to 1. 1 Quote Link to comment
Patthedog Posted January 31, 2020 Report Share Posted January 31, 2020 10 hours ago, datzenmike said: Standard cab short wheelbase would be lighter. Low range is 2 to 1. My truck is a 5/83 4x4 king cab deluxe with factory 3.889 as well 1 Quote Link to comment
datzenmike Posted January 31, 2020 Report Share Posted January 31, 2020 Option I guess. 1 Quote Link to comment
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