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The BMW Range
5 Series
E34
Auto Gearbox Overhaul for E34
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<blockquote data-quote="Vincent Hor" data-source="post: 311061" data-attributes="member: 1221"><p>Since I have done the Jatco conversion on my E34, this is my observation. My conversion is the complete full works i.e. GB, longshaft, wiring, GB ECU, rear diff 3.91 gear shifter plate & sensors.</p><p> </p><p>Some mechanics don't give you the full works.The rear diff is not replaced. Originally my M50B25 with GM 4 speed comes with a lower diff ratio of 4.10 (525) or it will be 4.45 for 520i</p><p> </p><p>A matching rear diff taken out of a Japan half cut M50B25 would be slightly taller at 3.91</p><p> </p><p>Having a rear diff or 4.10 or 4.45 will give you better acceleration but may lose out on top speed. The engine will also be running at higher RPM. Your fuel consumption on highway drive will also be higher.</p></blockquote><p></p>
[QUOTE="Vincent Hor, post: 311061, member: 1221"] Since I have done the Jatco conversion on my E34, this is my observation. My conversion is the complete full works i.e. GB, longshaft, wiring, GB ECU, rear diff 3.91 gear shifter plate & sensors. Some mechanics don't give you the full works.The rear diff is not replaced. Originally my M50B25 with GM 4 speed comes with a lower diff ratio of 4.10 (525) or it will be 4.45 for 520i A matching rear diff taken out of a Japan half cut M50B25 would be slightly taller at 3.91 Having a rear diff or 4.10 or 4.45 will give you better acceleration but may lose out on top speed. The engine will also be running at higher RPM. Your fuel consumption on highway drive will also be higher. [/QUOTE]
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Auto Gearbox Overhaul for E34
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