PodOne Posted June 3, 2020 Report Share Posted June 3, 2020 Afternoon fellow lock downers Before I go taking this apart I thought I'd ask. The Shell is off to go for blasting so the chassis is visible and I'm planning to beef up the front bridge another poor offering from Rimmers which after welding in place turned out has the opening on the front for the prop shaft on the wrong side! Plus the bridge spring hangers are made out of thinner gauged steel and have a weld across that is prone to cracking which is no good either. Anyway while having a quick look as you do and looking at the mounted diff from the top the diff input flange in relation to the chassis/top plate is off centre by around 1-2 inches to one side in relation to the inner tyre walls. I know the prop UJ's would compensate but it doesn't seem right. The chassis and diff pins etc measures square. I've tried looking for pics but nothing clearly shows the issue. I wonder if I've managed to some how reassembled the cast iron diff case up side down if that makes sense. So before I take some pics is the diff meant to be off set? Thanks Andy Quote Link to post Share on other sites
John L Posted June 3, 2020 Report Share Posted June 3, 2020 Andy You could ask CTM, who make the chassis, from a quick look in the manual the rear and front pins are equal distant from the centre line of the chassis, does that help? John Quote Link to post Share on other sites
scousegit Posted June 3, 2020 Report Share Posted June 3, 2020 Andy, the nose diff is offset to the offside when mounted on the chassis. Jon. Quote Link to post Share on other sites
stuart Posted June 3, 2020 Report Share Posted June 3, 2020 It is offset. Stuart. Quote Link to post Share on other sites
PodOne Posted June 3, 2020 Author Report Share Posted June 3, 2020 Hi Both John the pins/bridge are in the correct position. Jon so your saying the prop if at 90 degrees from the diff nose/ flange is to the off side is normal? Very strange way to design a rear end you would think the nose would line up with the centre of the chassis/gear box. Andy Quote Link to post Share on other sites
stuart Posted June 3, 2020 Report Share Posted June 3, 2020 2 minutes ago, PodOne said: Hi Both John the pins/bridge are in the correct position. Jon so your saying the prop if at 90 degrees from the diff nose/ flange is to the off side is normal? Very strange way to design a rear end you would think the nose would line up with the centre of the chassis/gear box. Andy See my picture above Stuart Quote Link to post Share on other sites
PodOne Posted June 3, 2020 Author Report Share Posted June 3, 2020 1 minute ago, stuart said: It is offset. Stuart. Thanks Stuart so it is offset for a while I thought I'd buggered up somehow. A strange way to design a car! Quote Link to post Share on other sites
stuart Posted June 3, 2020 Report Share Posted June 3, 2020 Just now, PodOne said: Thanks Stuart so it is offset for a while I thought I'd buggered up somehow. A strange way to design a car! Most rear drives are the same. Stuart. Quote Link to post Share on other sites
Z320 Posted June 3, 2020 Report Share Posted June 3, 2020 With the ingoing shaft of the diff in line with the gearbox you will have 2 different lengths of the driveshafts. You can decide what makes more sence.... Quote Link to post Share on other sites
reginald Posted June 3, 2020 Report Share Posted June 3, 2020 Hello My brother is building a mk1 group4 rally car he was told that the prop from gearbox to diff should not be completely In line as this can cause vibration but should be staggered, may be different with a fixed diff like TR Richard Quote Link to post Share on other sites
PodOne Posted June 3, 2020 Author Report Share Posted June 3, 2020 3 hours ago, reginald said: Hello My brother is building a mk1 group4 rally car he was told that the prop from gearbox to diff should not be completely In line as this can cause vibration but should be staggered, may be different with a fixed diff like TR Richard As Stuart says common but I can't remember MX5 having an offset and the diff is fixed to the rear sub frame and power plant ladder that acts like a torque tube which bolts to the gear box. Main thing is I haven't balls up (yet)! Thanks all Andy Quote Link to post Share on other sites
rcreweread Posted June 3, 2020 Report Share Posted June 3, 2020 Hi - you can see the offset clearly on the front mounting bracket in attached photos Cheers Rich Quote Link to post Share on other sites
Z320 Posted June 4, 2020 Report Share Posted June 4, 2020 Hi, if you look inside how a diff works you realize it always causes an offset in any way, either on the shafts from the gearbox to the diff or on the drive shafts. Ciao, Marco Quote Link to post Share on other sites
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