BronzeRS Posted June 9, 2008 Report Posted June 9, 2008 Hello people. Have a couple of questions that I have no doubt someone will be able to answer for me 1) Is there any distinguishable numbers or markings on a rear diff that will allow me to know what type i have?? If so, where can I find these?? 2) I have twin 40's that kinda went a bit wrong as i broke the casting on one of them during fitting. I am toying wth the idea that I may sell the whole lot onto someone who can do sommet with them and then look at fitting a bigger downdraught than the one I already have. Is this a good idea?? and if it is then what kind of size can i look at?? I have no clue as to what is on it but i am assuming it is the original unit from the rs2000. So what size does that make that?? Many thanks for the replies beforehand. Luke.
tonymk2wagon Posted June 9, 2008 Report Posted June 9, 2008 if your unlucky enough not to still have the tag on your diff bolt then your'll have to count the teeth or turns. carb your thinking of is a 38 dgas from a 3ltr capri
BronzeRS Posted June 9, 2008 Author Report Posted June 9, 2008 Is the 38dgas what i have or what i should be lookingat putting on?? I havent looked for the tag so i will look tomorrow
BronzeRS Posted June 9, 2008 Author Report Posted June 9, 2008 OK sorry !! answered my question by googling it. cheers
tonymk2wagon Posted June 9, 2008 Report Posted June 9, 2008 if you've got a tag on mate it will be on the lower bolts and will more than likely have 3.54 on it. 3.9 is more lively for a single carbed pinto and not terrible on long trips.
DAZZA Posted June 9, 2008 Report Posted June 9, 2008 Im tagging on to this thread, if I may. My 100E is running a 105E rear, so Im assuming its a 4.1 / 4.4? The ratio thing baffles me a bit, but I want longer legs basically. Is the 3.9 the longest? Im assuming the 3.54 is kind of half way? Ive got a Pinto with 5-speed.
tonymk2wagon Posted June 9, 2008 Report Posted June 9, 2008 3.5 is the tallest, 3.9 will be a big anprovment tho. smaller the number the lest turns to pinion. my wagon has a 3.9 and tops out at about 115 mph with 5 speed box. . that will be tat over a ton on 4 speed.
shaun1.6ghia Posted June 9, 2008 Report Posted June 9, 2008 sorry can i join, i have a 1977 escort ghia 1.6, what diff would i have (tag is missing) an what is is best for (low end, top speed or good for nothing.lol) thanks guys
DAZZA Posted June 9, 2008 Report Posted June 9, 2008 sorry can i join, i have a 1977 escort ghia 1.6, what diff would i have (tag is missing) an what is is best for (low end, top speed or good for nothing.lol) thanks guys You need a 4.1 mate, I know of one with one careful owner.
tonymk2wagon Posted June 9, 2008 Report Posted June 9, 2008 forgot to say, tyre size makes a massive difference, i'm on 175/50/13's and this is almost as much of a change as running a 4.1 diff when compared to 185/60's give or take.
shaun1.6ghia Posted June 9, 2008 Report Posted June 9, 2008 sorry can i join, i have a 1977 escort ghia 1.6, what diff would i have (tag is missing) an what is is best for (low end, top speed or good for nothing.lol) thanks guys You need a 4.1 mate, I know of one with one careful owner. so the 4.1 is the one to have? i dont know what the one is im running tho?(no tag) ideas?
DAZZA Posted June 9, 2008 Report Posted June 9, 2008 forgot to say, tyre size makes a massive difference, i'm on 175/50/13's and this is almost as much of a change as running a 4.1 diff when compared to 185/60's give or take. Im running 4.1 or 4.4 (?????) with a 5 speed and 185/60's. What do you make of that Tony? Would that be a sh*te combination to use? Shaun, I think you have the 3.9 or 3.54? Tony should know.
tonymk2wagon Posted June 9, 2008 Report Posted June 9, 2008 diff is normally a 3.9 or 3.89 (near as dam it the same) in mk2 1.6 but if it was auto i think come with 4.1. diff choice really comes down to what you use car for, hard fast driving 4.1,bit of both 3.9 and more motorway 3.5. other diffs are 3.7 and then 4.4 and going much lower but only really use for full race.
shaun1.6ghia Posted June 9, 2008 Report Posted June 9, 2008 diff is normally a 3.9 or 3.89 (near as dam it the same) in mk2 1.6 but if it was auto i think come with 4.1. diff choice really comes down to what you use car for, hard fast driving 4.1,bit of both 3.9 and more motorway 3.5. other diffs are 3.7 and then 4.4 and going much lower but only really use for full race. yeah it was an auto, thanks a lot for helping guys so it should be a 4.1
DAZZA Posted June 9, 2008 Report Posted June 9, 2008 Thats simplified things greatly mate! 3.9 / 3.89 it is. OOOps, kind of took over BronzeRS's thread...... sorry buddy hope you got your answers, ive been meaning to ask about this for ages.
BronzeRS Posted June 10, 2008 Author Report Posted June 10, 2008 No probs people......... Thats what the forums is for!! Tto get your questions answered and it has answered my question adequately. cheers:)
julian.jay Posted June 10, 2008 Report Posted June 10, 2008 This is a good site for comparing tyre size and speed. http://www.miata.net/garage/tirecalc.html. Julian
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